btrfs: pass fs_info to btrfs_del_root instead of tree_root

btrfs_del_roots always uses the tree_root.  Let's pass fs_info instead.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/free-space-tree.c b/fs/btrfs/free-space-tree.c
index a5e34de..684f122 100644
--- a/fs/btrfs/free-space-tree.c
+++ b/fs/btrfs/free-space-tree.c
@@ -1257,7 +1257,7 @@ int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info)
 	if (ret)
 		goto abort;
 
-	ret = btrfs_del_root(trans, tree_root, &free_space_root->root_key);
+	ret = btrfs_del_root(trans, fs_info, &free_space_root->root_key);
 	if (ret)
 		goto abort;