use new jack_session_event_free() in simple_session_client.c
use new jack_session_event_free() in simple_session_client.c

drobilla/jack1,ventosus/jack1,ventosus/jack1,drobilla/jack1,drobilla/jack1,drobilla/jack1,adiknoth/tschack,ventosus/jack1,ventosus/jack1,adiknoth/tschack