namei: parse all path arguments when an optarg path will fail

namei: parse all path arguments when an optarg path will fail

Old implementation of namei listed path all the way to non-existing
file or directory, something like:

f: /usr/bin/nxdir/file
 d /
 d usr
 d bin
 ? nxdir - No such file or directory (2)

whiles the current implementation prints:

namei: failed to stat: /usr/bin/nxdir/file: No such file or directory

The new output it's not helpful. I am especially interested see where
the path is broken when a path is symlink to other path with symlink,
and few more like that, and something somewhere is broken.

[kzak@redhat.com: - coding style changes]

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