gtk: mark gtk_mount_operation_get_parent as nullable

diff --git a/gtk/gtkmountoperation.c b/gtk/gtkmountoperation.c
index baa4f785e53de7009fb6f4853ae1c2ef2efaed89..43760283b408c4f1c9e1b932f98a102fad0665ef 100644 (file)
--- a/gtk/gtkmountoperation.c
+++ b/gtk/gtkmountoperation.c
@@ -1873,7 +1873,7 @@ gtk_mount_operation_set_parent (GtkMountOperation *op,
  *
  * Gets the transient parent used by the `GtkMountOperation`.
  *
- * Returns: (transfer none): the transient parent for windows shown by @op
+ * Returns: (transfer none) (nullable): the transient parent for windows shown by @op
  */
 GtkWindow *
 gtk_mount_operation_get_parent (GtkMountOperation *op)