[gtk/bilelmoussaoui/g-i] gtk: mark gtk_no_selection_get_model nullable

[Bilal Elmoussaoui <bilelmoussaoui src gnome org>]

commit f846eec894113d561d7083ce9bb5dd2268edc40b
Author: Bilal Elmoussaoui <bil elmoussaoui gmail com>
Date:   Sat Jan 1 17:56:07 2022 +0100

    gtk: mark gtk_no_selection_get_model nullable
    
    The constructor is nullable so should the getter be

 gtk/gtknoselection.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtknoselection.c b/gtk/gtknoselection.c
index 7727ccc00b..9b48082d6a 100644
--- a/gtk/gtknoselection.c
+++ b/gtk/gtknoselection.c
@@ -242,7 +242,7 @@ gtk_no_selection_new (GListModel *model)
  *
  * Gets the model that @self is wrapping.
  *
- * Returns: (transfer none): The model being wrapped
+ * Returns: (transfer none) (nullable): The model being wrapped
  */
 GListModel *
 gtk_no_selection_get_model (GtkNoSelection *self)