The BufferSource::allocate() return value isn't propagated correctly,
resulting in a test failure when the test should be skipped due to a
missing vivid device. Fix it.
While at it, return valid status codes from BufferSource::allocate() in
all error cases, with proper diagnostic messages.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
a39b91d44e