[Bug 781022] tests: fix leak in videoframe-audiolevel test

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=781022

Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> changed:

           What    |Removed                     |Added
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 Attachment #349439|accepted-commit_after_freez |none
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--- Comment #3 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> ---
Created attachment 349447
  --> https://bugzilla.gnome.org/attachment.cgi?id=349447&action=edit
fix leak in videoframe-audiolevel test

With extra braces.

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