do not call if_start() from tx_done() unless there is a reason to do so (IFF_OACTIVE was set.)
do not call if_start() from tx_done() unless there is a reason to do so
(IFF_OACTIVE was set.)

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