[Bug 772455] vaapisink: possible race in wayland_sync

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772455

--- Comment #1 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 337232
  --> https://bugzilla.gnome.org/attachment.cgi?id=337232&action=edit
sink: wayland: bail out if no pending frames

Don't poll the display fd if there are not pending frames. This could happen
if there's another thread flushing.

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