[gnome-settings-daemon] wacom: Fix potential warning on startup

[Bastien Nocera <hadess src gnome org>]

commit 1b095209a80b032622a60a889c0ca85f75b2d3bf
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Oct 4 09:12:10 2013 +0200

    wacom: Fix potential warning on startup
    
    When the window isn't setup yet, no need to try and invalidate
    the whole drawing area.

 plugins/wacom/gsd-wacom-osd-window.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/plugins/wacom/gsd-wacom-osd-window.c b/plugins/wacom/gsd-wacom-osd-window.c
index 03e7f13..ef313a1 100644
--- a/plugins/wacom/gsd-wacom-osd-window.c
+++ b/plugins/wacom/gsd-wacom-osd-window.c
@@ -1242,7 +1242,8 @@ redraw_window (GsdWacomOSDWindow *self)
        GdkWindow *window;
 
        window = gtk_widget_get_window (GTK_WIDGET (self));
-       gdk_window_invalidate_rect (window, NULL, FALSE);
+       if (window)
+               gdk_window_invalidate_rect (window, NULL, FALSE);
 }
 
 static GsdWacomOSDButton *