[Bug 765903] fix various leaks in tests

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765903

--- Comment #2 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 327147
  --> https://bugzilla.gnome.org/attachment.cgi?id=327147&action=edit
fakesink: fix pipeline leak in test

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