stack: Make static analyzer happy

diff --git a/gtk/gtkstack.c b/gtk/gtkstack.c
index fc6a46347eda182e7ff7ec939f596aca43afbdfc..887c9cf6c9667eaf13448aee2d9a63ee46681aa8 100644 (file)
--- a/gtk/gtkstack.c
+++ b/gtk/gtkstack.c
@@ -1301,6 +1301,7 @@ stack_child_visibility_notify_cb (GObject    *obj,
   GtkStackPage *child_info;
 
   child_info = find_child_info_for_widget (stack, child);
+  g_return_if_fail (child_info != NULL);
 
   if (priv->visible_child == NULL &&
       gtk_widget_get_visible (child))