xfs_repair: remove unused fs_sb_feature_bits_allowed

fs_sb_feature_bits_allowed is never set to anything but 1;
remove it and all associated code.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>

3 files changed