void llc_station_service_events ( void);
Get an event from the station event queue (if any); attempt to service the event; if event serviced, get the next event (if any) on the event queue; if event not service, re-queue the event on the event queue and attempt to service the next event; when serviced all events in queue, finished; if don't transition to different state, just service all events once; if transition to new state, service all events again. Caller must hold llc_main_station.ev_q.lock.