sfdisk: cleanup 83 gcc warnings

sfdisk: cleanup 83 gcc warnings

Fix strict gcc warnings that come from using:
  ("-Wall -Wp,-D_FORTIFY_SOURCE=2")

83 warnings fixed:
sfdisk.c:249: warning: pointer targets in initialization differ in signedness
sfdisk.c:376: warning: pointer targets in passing argument 1 of 'chars_to_ulong' differ in signedness
sfdisk.c:702: warning: pointer targets in passing argument 1 of 'copy_to_int' differ in signedness
sfdisk.c:703: warning: pointer targets in passing argument 1 of 'copy_to_int' differ in signedness
sfdisk.c:1709: warning: pointer targets in passing argument 1 of 'fgets' differ in signedness
sfdisk.c:1709: warning: pointer targets in assignment differ in signedness
sfdisk.c:1714: warning: pointer targets in passing argument 1 of 'index' differ in signedness
sfdisk.c:1714: warning: pointer targets in assignment differ in signedness
sfdisk.c:1719: warning: pointer targets in passing argument 1 of 'index' differ in signedness
sfdisk.c:1719: warning: pointer targets in assignment differ in signedness
sfdisk.c:1723: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:1723: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:1723: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:1723: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:1723: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:1723: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:1729: warning: pointer targets in passing argument 1 of 'index' differ in signedness
sfdisk.c:1729: warning: pointer targets in assignment differ in signedness
sfdisk.c:1739: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:1739: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:1739: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:1739: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:1739: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:1739: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:1739: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:1739: warning: pointer targets in passing argument 1 of 'strncmp' differ in signedness
sfdisk.c:2021: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:2021: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2021: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:2021: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2021: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2021: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2059: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:2059: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2059: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:2059: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2059: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2059: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2061: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:2061: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2061: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:2061: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2061: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2061: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2063: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:2063: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2063: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:2063: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2063: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2063: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2065: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:2065: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2065: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:2065: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2065: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2065: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2067: warning: pointer targets in passing argument 1 of 'get_ul' differ in signedness
sfdisk.c:2083: warning: pointer targets in passing argument 1 of 'get_ul' differ in signedness
sfdisk.c:2096: warning: pointer targets in passing argument 1 of 'get_ul' differ in signedness
sfdisk.c:2130: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:2130: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2130: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:2130: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2130: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2130: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2132: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:2132: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2132: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:2132: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2132: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2132: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2132: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:2132: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2132: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
sfdisk.c:2132: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2132: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2132: warning: pointer targets in passing argument 1 of '__builtin_strcmp' differ in signedness
sfdisk.c:2154: warning: pointer targets in passing argument 1 of 'get_ul' differ in signedness
sfdisk.c:2155: warning: pointer targets in passing argument 1 of 'get_ul' differ in signedness
sfdisk.c:2156: warning: pointer targets in passing argument 1 of 'get_ul' differ in signedness
sfdisk.c:2167: warning: pointer targets in passing argument 1 of 'get_ul' differ in signedness
sfdisk.c:2168: warning: pointer targets in passing argument 1 of 'get_ul' differ in signedness
sfdisk.c:2169: warning: pointer targets in passing argument 1 of 'get_ul' differ in signedness

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Karel Zak <kzak@redhat.com>