Correct the setup of the intial TCP state window and pre-validate th_ack on an FIN|ACK close if the client has never responded.
Correct the setup of the intial TCP state window and pre-validate th_ack
on an FIN|ACK close if the client has never responded.

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