[Bug 796596] videoaggregator: Fix string leak

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796596

--- Comment #1 from Seungha Yang <pudding8757 at gmail.com> ---
Created attachment 372690
  --> https://bugzilla.gnome.org/attachment.cgi?id=372690&action=edit
videoaggregator: Fix string leak

Both master and 1.14 branches show this leak

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