[mutter/wayland] screen: Fix build

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

commit 965a784c8a355ddf94f3db0a38c4de1a00994d50
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Mon Feb 3 17:59:59 2014 -0500

    screen: Fix build
    
    I thought I finished this patch last night... I guess not

 src/core/screen-private.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/core/screen-private.h b/src/core/screen-private.h
index 3d02e18..e3a3c77 100644
--- a/src/core/screen-private.h
+++ b/src/core/screen-private.h
@@ -241,7 +241,7 @@ void     meta_screen_workspace_switched (MetaScreen         *screen,
 
 void meta_screen_set_active_workspace_hint (MetaScreen *screen);
 
-Window   meta_screen_create_guard_window (Display *xdisplay, MetaScreen *screen);
+void meta_screen_create_guard_window (MetaScreen *screen);
 
 gboolean meta_screen_handle_xevent (MetaScreen *screen,
                                     XEvent     *xevent);