fat: fix too many log in fat_chain_add()

This log was excessive for a serial console.  So use the ratelimited
version instead.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: OGAWA Hirofumi <[email protected]>
Reported-by: [email protected]
Closes: https://syzkaller.appspot.com/bug?extid=fa7ef54f66c189c04b73
Cc: Namjae Jeon <[email protected]>
Cc: Sungjong Seo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: OGAWAHirofumi

fs/fat/misc.c

@@ -158,9 +158,9 @@ int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster)
 			mark_inode_dirty(inode);
 	}
 	if (new_fclus != (inode->i_blocks >> (sbi->cluster_bits - 9))) {
-		fat_fs_error(sb, "clusters badly computed (%d != %llu)",
-			     new_fclus,
-			     (llu)(inode->i_blocks >> (sbi->cluster_bits - 9)));
+		fat_fs_error_ratelimit(
+			sb, "clusters badly computed (%d != %llu)", new_fclus,
+			(llu)(inode->i_blocks >> (sbi->cluster_bits - 9)));
 		fat_cache_inval_inode(inode);
 	}
 	inode->i_blocks += nr_cluster << (sbi->cluster_bits - 9);