Btrfs: disk-io.c (open_ctree): avoid leaks upon allocation failure

Signed-off-by: Chris Mason <chris.mason@oracle.com>

fs/btrfs/disk-io.c

@@ -1699,6 +1699,8 @@ struct btrfs_root *open_ctree(struct super_block *sb,
 	kfree(tree_root);
 	bdi_destroy(&fs_info->bdi);
 	kfree(fs_info);
+	kfree(chunk_root);
+	kfree(dev_root);
 	return ERR_PTR(err);
 }