[Bug 711010] videomixer: remove unneeded guint comparaison

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=711010
  GStreamer | gst-plugins-good | unspecified

Olivier Crete (Tester) <olivier.crete> changed:

           What    |Removed                     |Added
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   Target Milestone|HEAD                        |1.3.1

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