[Bug 703399] v4l2: don't extract data from caps twice

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=703399
  GStreamer | gst-plugins-good | git

--- Comment #3 from Michael Olbrich <m.olbrich at pengutronix.de> 2013-07-01 15:39:45 UTC ---
sorry about attaching the patch multiple times. My browser was doing strange
things and I guess I was a bit impatient and tried to attach the patch again...

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