[Bug 795224] wayland: don't poll if there are no pending frames

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795224

--- Comment #1 from Michael Olbrich <m.olbrich at pengutronix.de> ---
Created attachment 370882
  --> https://bugzilla.gnome.org/attachment.cgi?id=370882&action=edit
wayland: don't poll if there are no pending frames

Otherwise the following poll may not return for an arbitrary amount of
time. This can happen if another wayland event queue has flushed and read
our events.

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