repair: Repair directory block CRC mismatches

repair: Repair directory block CRC mismatches

It can happen that just CRC doesn't match for directory blocks. In that
case xfs_repair will just report the error but won't fix anything (as
further checking of the block doesn't reveal any problems). Make sure we
recompute and write out new CRC when we failed verification during
reading.

Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>