Replace sc_dying in favour of usbd_is_dying() and usbd_deactivate().
Replace sc_dying in favour of usbd_is_dying() and usbd_deactivate().

Okay mpi@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars