test: io: update i/o api usage re: b_error

io-test/tree.c

@@ -13,11 +13,10 @@ int main(int argc, const char **argv)
 
 	b_directory *dir = NULL;
 	b_path *path = b_path_create_from_cstr(argv[1]);
-	b_status status = b_directory_open(B_DIRECTORY_ROOT, path, &dir);
+	b_result result = b_directory_open(B_DIRECTORY_ROOT, path, 0, &dir);
 
-	if (!B_OK(status)) {
-		printf("cannot open %s\n", b_path_ptr(path));
-		printf("%s\n", b_status_to_string(status));
+	if (b_result_is_error(result)) {
+		b_throw(result);
 		return -1;
 	}