staging: comedi: usbduxfast: introduce usbduxfast_ai_handle_urb()

Factor the urb handling and resubmit out of the completion handler and
tidy it up. This allows a common exit path to be used in the completion
handler to stop the async command and handle the events.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: Bernd Porr <mail@berndporr.me.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>