[Bug 638300] v4l2src: make this work more than once in a row

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=638300
  GStreamer | gst-plugins-good | unspecified

--- Comment #8 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> 2011-08-25 22:53:50 UTC ---
Add comment in the code about why we don't skip.

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