xfs_repair: fix incorrect return value in namecheck()

xfs_repair: fix incorrect return value in namecheck()

Obviously a directory entry with a '/' in the name should return
1, i.e. failure.  This was just a dumb thinko.

Fixes: 45571fd5885d ("xfs_repair: allow '/' in attribute names")
Reported-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Bill O'Donnell <billodo@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>