Do not allow the listen(2) syscall for an already connected socket. This would create a weird set of states in TCP.  FreeBSD has the same check. Issue found by and OK guenther@
Do not allow the listen(2) syscall for an already connected socket.
This would create a weird set of states in TCP.  FreeBSD has the
same check.
Issue found by and OK guenther@

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