[Bug 777146] vaapisink: segfault caused by race condition with OverlayInterface expose method

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777146

--- Comment #6 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
(In reply to Víctor Manuel Jáquez Leal from comment #5)
> Created attachment 343388 [details] [review]
> vaapisink: don't use member variable outside lock
> 
> Thus a race condition segfault is avoided.

@Matt, 

What do you think about this version of the patch? I think it is simpler. But I
haven't tested it.

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