- * Returns: (transfer none): a pointer that should be used for the
- * gst_task_pool_join function. This pointer can be NULL, you must
- * check @error to detect errors.
+ * Returns: (transfer none) (nullable): a pointer that should be used
+ * for the gst_task_pool_join function. This pointer can be %NULL, you
+ * must check @error to detect errors.