[gtk+] Fix 'void function should not return void expression' warning for clang

[Ting-Wei Lan <lantw src gnome org>]

commit 41b6993a66a6173434d1bca3f71d2596f094b121
Author: Ting-Wei Lan <lantw src gnome org>
Date:   Sat Jun 13 13:45:57 2015 +0800

    Fix 'void function should not return void expression' warning for clang
    
    https://bugzilla.gnome.org/show_bug.cgi?id=750888

 gdk/gdkwindow.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index 65db5e8..8edaa55 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -11084,7 +11084,10 @@ gdk_window_get_unscaled_size (GdkWindow *window,
       impl_class = GDK_WINDOW_IMPL_GET_CLASS (window->impl);
 
       if (impl_class->get_unscaled_size)
-        return impl_class->get_unscaled_size (window, unscaled_width, unscaled_height);
+        {
+          impl_class->get_unscaled_size (window, unscaled_width, unscaled_height);
+          return;
+        }
     }
 
   scale = gdk_window_get_scale_factor (window);