[Bug 754042] v4l2src: Asserts on renegotiation with USERPTR

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754042

--- Comment #4 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 329335
  --> https://bugzilla.gnome.org/attachment.cgi?id=329335&action=edit
v4l2-util: Introduce GstV4l2Error

This is to allow returning an error that can easily be sent as
message to the application if the element needs it. Using this
also allow ignoring errors.

https://bugzilla.gnome.org/show_bug.cgi?id=766172

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