kwin_wayland xdgv6: crash on ping

[David Edmundson]

>
> I can imagine this crash if we have two windows belonging to the same
> process, and the client dies. We handle the first one closing (frame 18)
> and in doing so activate the second window of that now disconnected app.
> Under X that situation would just be a harmless BadWindow  error.
>

Edit: It was this ^. The app was crashing. That kills the global before the
surfaces which is what brought down kwin. (and when kwin is down you can't
see that an app crashed just before)
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