[Bug 756628] audioclock: Add run time type check safety

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=756628

--- Comment #11 from Marcin Kolny (IRC: loganek) <marcin.kolny at gmail.com> ---
Since I don't have write-access to the repository, please push my patch
(whenever you want).

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