[gtk+/parasite] Avoid a compiler warning

[Matthias Clasen <matthiasc src gnome org>]

commit 85c68925fe7f7e7abfb400f05bf318a92f838f11
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat May 3 01:53:56 2014 -0400

    Avoid a compiler warning

 modules/other/parasite/window.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/modules/other/parasite/window.c b/modules/other/parasite/window.c
index b020526..6d09426 100644
--- a/modules/other/parasite/window.c
+++ b/modules/other/parasite/window.c
@@ -199,7 +199,7 @@ gtkparasite_window_create (void)
   g_free (title);
 
   group = gtk_window_group_new ();
-  gtk_window_group_add_window (group, window->window);
+  gtk_window_group_add_window (group, GTK_WINDOW (window->window));
 
   vpaned = gtk_paned_new (GTK_ORIENTATION_VERTICAL);
   gtk_widget_show (vpaned);