rem: void opn_session_free(OpnSession *session)
add: void opn_session_free(OpnSession *session, BOOL del_list)
context: void opn_session_free(OpnSession *session){	if (!session)		return;	if (session->con)		tcp_close(session->con);	if (OPENNAP->sessions)		OPENNAP->sessions = list_remove(OPENNAP->sessions, session);		free(session);}