btrfs: get fs_info from eb in btrfs_check_node

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/disk-io.c

@@ -657,7 +657,7 @@ static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
 		ret = -EIO;
 	}
 
-	if (found_level > 0 && btrfs_check_node(fs_info, eb))
+	if (found_level > 0 && btrfs_check_node(eb))
 		ret = -EIO;
 
 	if (!ret)

fs/btrfs/tree-checker.c

@@ -973,8 +973,9 @@ int btrfs_check_leaf_relaxed(struct extent_buffer *leaf)
 	return check_leaf(leaf, false);
 }
 
-int btrfs_check_node(struct btrfs_fs_info *fs_info, struct extent_buffer *node)
+int btrfs_check_node(struct extent_buffer *node)
 {
+	struct btrfs_fs_info *fs_info = node->fs_info;
 	unsigned long nr = btrfs_header_nritems(node);
 	struct btrfs_key key, next_key;
 	int slot;

fs/btrfs/tree-checker.h

@@ -21,7 +21,7 @@ int btrfs_check_leaf_full(struct extent_buffer *leaf);
  * Will only check item pointers, not reading item data.
  */
 int btrfs_check_leaf_relaxed(struct extent_buffer *leaf);
-int btrfs_check_node(struct btrfs_fs_info *fs_info, struct extent_buffer *node);
+int btrfs_check_node(struct extent_buffer *node);
 
 int btrfs_check_chunk_valid(struct btrfs_fs_info *fs_info,
 			    struct extent_buffer *leaf,