column: EOF handling bug

column: EOF handling bug

For the last line of the file lenght of line should be determined
where the EOF is instead of new line. Old output was

$ printf "1 2\n3" | column -t
column: line too long
1 2

which this commit will change to

$ printf "1 2\n3" | column -t
1  2
3

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
Signed-off-by: Karel Zak <kzak@redhat.com>