[Bug 709814] [examples/overlay] avoid to unref sink if not found. Also fix logic to find a sink in one of the example.

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=709814
  GStreamer | gst-plugins-base | git

--- Comment #3 from Julien Isorce <julien.isorce at gmail.com> 2013-10-10 14:55:37 UTC ---
Yes and maybe it should just use only autovideosink.

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