[Bug 767161] gsta2dpsink: unref avdtpsink if state transition failed

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767161

--- Comment #1 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 328946
  --> https://bugzilla.gnome.org/attachment.cgi?id=328946&action=edit
gsta2dpsink: unref avdtpsink if state transition failed

If for some reason the avdtpsink element can't go READY then the
gsta2dpsink can't either and so should release the ressources it
allocates when trying to do so.

Fix a leak with the generic/states test.

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