Fixed bugs in UNMONITOR-SOCKET for KQUEUE-POLLER.
Fixed bugs in UNMONITOR-SOCKET for KQUEUE-POLLER.

1. Arguments to GETHASH around the wrong way.
2. Do not change the monitored events if the socket is closed.
3. Call DESCRIPTOR-SOCKET-TABLE on the poller object, not the socket object.

markcox80/basic-binary-ipc,markcox80/basic-binary-ipc