[Bug 765903] fix various leaks in tests

[GStreamer (GNOME Bugzilla)]

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

Tim-Philipp Müller <t.i.m at zen.co.uk> changed:

           What    |Removed                     |Added
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                 CC|                            |t.i.m at zen.co.uk

--- Comment #11 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
we make it ignore stuff that's still reachable (e.g. in global variables).

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