Get the tests in
- [[https://github.com/freebsd-net/tcp-testsuite/blob/master/state-event-engine/rcv-fin-closed/README.md | rcv-fin-closed ]]
- [[https://github.com/freebsd-net/tcp-testsuite/blob/master/state-event-engine/rcv-syn-fin-closed/README.md | rcv-syn-fin-closed]]
passing.