[gtk+] gtkwindow: Fix cast warning

[Jasper St. Pierre <jstpierre src gnome org>]

commit 55605fe68578a233a89110aa7aff316d327613a4
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Sun Nov 17 18:48:28 2013 -0500

    gtkwindow: Fix cast warning

 gtk/gtkwindow.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 7206fd8..27fc7d1 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -11742,5 +11742,5 @@ void
 _gtk_window_get_decoration_size (GtkWindow *window,
                                  GtkBorder *border)
 {
-  get_decoration_size (window, border);
+  get_decoration_size (GTK_WIDGET (window), border);
 }