[Bug 759443] videoframe-audiolevel: Fix possible division by zero

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759443

--- Comment #1 from Vivia Nikolaidou <vivia at ahiru.eu> ---
Created attachment 317350
  --> https://bugzilla.gnome.org/attachment.cgi?id=317350&action=edit
First version of patch

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