gtk: mark gtk_glarea_get_context as nullable

diff --git a/gtk/gtkglarea.c b/gtk/gtkglarea.c
index 655c102cd75657a0a7d485b9c16ea68b40a45b25..de7cc7fa0fd55f690fff8e535de942f9869c2e9c 100644 (file)
--- a/gtk/gtkglarea.c
+++ b/gtk/gtkglarea.c
@@ -1317,7 +1317,7 @@ gtk_gl_area_set_auto_render (GtkGLArea *area,
  *
  * Retrieves the `GdkGLContext` used by @area.
  *
- * Returns: (transfer none): the `GdkGLContext`
+ * Returns: (transfer none) (nullable): the `GdkGLContext`
  */
 GdkGLContext *
 gtk_gl_area_get_context (GtkGLArea *area)