[Bug 754214] unused variable warnings

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754214

--- Comment #1 from Young Han Lee <joybro201 at gmail.com> ---
Created attachment 310147
  --> https://bugzilla.gnome.org/attachment.cgi?id=310147&action=edit
suggested patch

Suggested patch.

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