[gtk+] Don't return a value from a void function

[Matthias Clasen <matthiasc src gnome org>]

commit 25a4e8e7de6591a29828c00eede1670d399a08ab
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jul 17 18:05:17 2011 -0400

    Don't return a value from a void function
    
    Reported in bug 654720, patch by Brian Cameron.

 gdk/gdkwindow.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index 6700f67..71405f3 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -10702,7 +10702,7 @@ gdk_drag_begin_for_device (GdkWindow     *window,
 void
 gdk_test_render_sync (GdkWindow *window)
 {
-  return GDK_WINDOW_IMPL_GET_CLASS (window->impl)->sync_rendering (window);
+  GDK_WINDOW_IMPL_GET_CLASS (window->impl)->sync_rendering (window);
 }
 
 /**