Verify that the timer deadline stays valid after the timer expires. As
the test now uses the deadline in order to compute the jitter, the
interval_ field isn't used anymore and can be removed.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>