[Bug 583890] v4l2: Implement V4L2_MEMORY_DMABUF/USERPTR support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=583890

--- Comment #71 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
Created attachment 373383
  --> https://bugzilla.gnome.org/attachment.cgi?id=373383&action=edit
v4l2bufferpool: Only queue buffer if preparation worked

The preparation code imports the buffer, doing bunch of
validation. Only queue the buffer in the driver if the
importation worked. This way we don't rely on the driver
to validate.

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