mufs: only claim ownership of the tree object as the final step in resolve_path()

source/fs/mufs/dir.c

@@ -128,7 +128,9 @@ struct mufs_tree *resolve_path(struct mufs *fs, const char *path)
 
 		if (ret < 0)
 			goto err_closedir;
+	}
 
+	if (dir) {
 		tree = dir->tree;
 		dir->tree = NULL;
 	}