[Bug 709814] New: [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

           Summary: [examples/overlay] avoid to unref sink if not found.
                    Also fix logic to find a sink in one of the example.
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: minor
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: julien.isorce at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=256903)
 View: https://bugzilla.gnome.org/attachment.cgi?id=256903
 Review: https://bugzilla.gnome.org/review?bug=709814&attachment=256903

unref sink only when found

Spotted because I have ximagesink but not xvimagesink:

For gtk-videooverlay and qt-videooverlay, the sink is unref even if not found.

For qtgv-videooverlay the logic to find the sink is wrong. If the first sink is
not found them it do not check for the next.

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