[Bug 755867] playsink: fix leak of audio sink

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755867

--- Comment #8 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
After 508 iterations btw, and it's the bus that is failing with this error when
creating it.

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