[gtk/matthiasc/for-master: 8/9] gtk-demo: Plug another leak

[Matthias Clasen <matthiasc src gnome org>]

commit 96c0fbf20972d2128eb765cc9d429e6be572eea4
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu May 21 16:24:20 2020 -0400

    gtk-demo: Plug another leak
    
    We were leaking the builder in the css blendmodes demo,
    by creating a ref cycle. This was showing up as
    the list entry not going back to upright after
    closing the window.

 demos/gtk-demo/css_blendmodes.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/demos/gtk-demo/css_blendmodes.c b/demos/gtk-demo/css_blendmodes.c
index 3ddbbc0c37..df791aad31 100644
--- a/demos/gtk-demo/css_blendmodes.c
+++ b/demos/gtk-demo/css_blendmodes.c
@@ -134,6 +134,8 @@ do_css_blendmodes (GtkWidget *do_widget)
                                                   GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
 
       setup_listbox (builder, provider);
+
+      g_object_unref (builder);
     }
 
   if (!gtk_widget_get_visible (window))