[gtk/bilelmoussaoui/annotations-fix] Update gtksingleselection.c

[Bilal Elmoussaoui <bilelmoussaoui src gnome org>]

commit af1194775dd0baf86741b6ccd5ad215e2bdab08b
Author: Bilal Elmoussaoui <bil elmoussaoui gmail com>
Date:   Wed Mar 3 13:08:18 2021 +0000

    Update gtksingleselection.c

 gtk/gtksingleselection.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtksingleselection.c b/gtk/gtksingleselection.c
index 85924145ce..91f3261d6a 100644
--- a/gtk/gtksingleselection.c
+++ b/gtk/gtksingleselection.c
@@ -625,7 +625,7 @@ gtk_single_selection_set_selected (GtkSingleSelection *self,
  *
  * If no item is selected, %NULL is returned.
  *
- * Returns: (transfer none) (type GObject): The selected item
+ * Returns: (transfer none) (type GObject) (nullable): The selected item
  */
 gpointer
 gtk_single_selection_get_selected_item (GtkSingleSelection *self)