[Bug 751104] make Gtk sinks usable from gst-launch

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751104

--- Comment #1 from Xavier Claessens <xclaesse at gmail.com> ---
Created attachment 305474
  --> https://bugzilla.gnome.org/attachment.cgi?id=305474&action=edit
GstGtkGLSink: fix possible warning in finalize

If the element is finalized before going in READY state
the widget could still be NULL.

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