[S390] cio: Delete timer in ccw_device_verify_done().

Make sure pending timers are always deleted, even if we don't go
through ccw_device_done().

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>