[Bug 790940] v4l2src selecting dmabuf io-mode on driver not supporting dmabuf

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790940

--- Comment #9 from Florent Thiéry <florent.thiery at ubicast.eu> ---
Created attachment 364614
  --> https://bugzilla.gnome.org/attachment.cgi?id=364614&action=edit
fix errno value check

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