[Bug 781695] vaapi: leak of vpp surface in GstVaapiWindowWayland

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=781695

--- Comment #1 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 350371
  --> https://bugzilla.gnome.org/attachment.cgi?id=350371&action=edit
libs: windows: wayland: fix leak if failure of sync

Sometimes gst_vaapi_window_wayland_sync returns FALSE when poll returns EBUSY
during destruction.
In this case, if GstVaapiWindow is using vpp, leak of vpp surface happens.
This surface is not attached to anything at this moment, so we should release
it manually.

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