[Bug 772851] tracers: fix structure leak

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772851

--- Comment #4 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> ---
About using NULL, no idea what this does in the first place, first time I see
tracers, no clue what it even does (though I have my theory).

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