xfs: never try to scrub more than 64 inodes per inobt record

Make sure we never check more than XFS_INODES_PER_CHUNK inodes for any
given inobt record since there can be more than one inobt record mapped
to an inode cluster.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>

fs/xfs/scrub/ialloc.c

@@ -203,7 +203,8 @@ xchk_iallocbt_check_freemask(
 	int				error = 0;
 
 	/* Make sure the freemask matches the inode records. */
-	nr_inodes = mp->m_inodes_per_cluster;
+	nr_inodes = min_t(unsigned int, XFS_INODES_PER_CHUNK,
+			mp->m_inodes_per_cluster);
 
 	for (agino = irec->ir_startino;
 	     agino < irec->ir_startino + XFS_INODES_PER_CHUNK;