[Bug 780442] gtreamer-vaapi render multi video in single pipeline causing videos not killed with vaapisink in wayland

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=780442

--- Comment #19 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 350037
  --> https://bugzilla.gnome.org/attachment.cgi?id=350037&action=edit
libs: window: wayland: sending null buffer when  destruction

Fix leakage of the last wl buffer.

This is another main problem on GstVaapiWindowWayland, which is described on
#774029.
It needs to send null buffer while destruction, so that it assures all wl
buffers are 
released. Otherwise, usually the last buffer's callback is not called,
which leads to leak of GstVaapiDisplay. This is motivated by gstwaylandsink.

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