*
* Peek the head element of the queue without removing it from the queue.
*
- * Returns: (transfer none): the head element of @queue or NULL when
+ * Returns: (transfer none): the head element of @queue or %NULL when
* the queue is empty.
*/
gpointer
*
* Get the head element of the queue.
*
- * Returns: (transfer full): the head element of @queue or NULL when
+ * Returns: (transfer full): the head element of @queue or %NULL when
* the queue is empty.
*/
gpointer