[gtk+] window: Don't leak the GskRenderer

[Timm Bäder <baedert src gnome org>]

commit ca305bb59694c2237ed069ce14c0779b992080ab
Author: Timm Bäder <mail baedert org>
Date:   Fri Oct 21 10:12:40 2016 +0200

    window: Don't leak the GskRenderer

 gtk/gtkwindow.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index d0233ec..7499344 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -5680,6 +5680,8 @@ gtk_window_finalize (GObject *object)
   if (priv->drag_gesture)
     g_object_unref (priv->drag_gesture);
 
+  g_clear_object (&priv->renderer);
+
   G_OBJECT_CLASS (gtk_window_parent_class)->finalize (object);
 }