lsattr: exit with a non-zero status on errors

lsattr: exit with a non-zero status on errors

lsattr doesn't return an error if you point it at a file that
doesn't exist.

This is slightly trickier because it can take more than one
file as an arg, but ls seems to report an error if any occurred,
so this does the same, it'll report the last error that was
encountered.

Addresses-RedHat-Bugzilla: #489841
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>