[mutter] wayland-surface: Add some extra protection

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

commit b60e02956da0c4517ab2a46ee0ee6370ca0ef4fa
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Sun Jul 27 17:13:31 2014 +0200

    wayland-surface: Add some extra protection
    
    Make sure we're not configuring some sort of weird surface.

 src/wayland/meta-wayland-surface.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/wayland/meta-wayland-surface.c b/src/wayland/meta-wayland-surface.c
index 77bef1b..4b9e5b2 100644
--- a/src/wayland/meta-wayland-surface.c
+++ b/src/wayland/meta-wayland-surface.c
@@ -1836,6 +1836,8 @@ meta_wayland_surface_configure_notify (MetaWaylandSurface *surface,
   else if (surface->wl_shell_surface.resource)
     wl_shell_surface_send_configure (surface->wl_shell_surface.resource,
                                      0, new_width, new_height);
+  else
+    g_assert_not_reached ();
 }
 
 void