btrfs: tree-checker: get fs_info from eb in check_csum_item

We can read fs_info from extent buffer and can drop it from the
parameters.
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/tree-checker.c

@@ -188,10 +188,10 @@ static int check_extent_data_item(struct btrfs_fs_info *fs_info,
 	return 0;
 }
 
-static int check_csum_item(struct btrfs_fs_info *fs_info,
-			   struct extent_buffer *leaf, struct btrfs_key *key,
+static int check_csum_item(struct extent_buffer *leaf, struct btrfs_key *key,
 			   int slot)
 {
+	struct btrfs_fs_info *fs_info = leaf->fs_info;
 	u32 sectorsize = fs_info->sectorsize;
 	u32 csumsize = btrfs_super_csum_size(fs_info->super_copy);
 
@@ -784,7 +784,7 @@ static int check_leaf_item(struct btrfs_fs_info *fs_info,
 		ret = check_extent_data_item(fs_info, leaf, key, slot);
 		break;
 	case BTRFS_EXTENT_CSUM_KEY:
-		ret = check_csum_item(fs_info, leaf, key, slot);
+		ret = check_csum_item(leaf, key, slot);
 		break;
 	case BTRFS_DIR_ITEM_KEY:
 	case BTRFS_DIR_INDEX_KEY: