add: DEBUG_LOG("! unregistered callback to %.*s, %p\n", _p->uri.len, _p->uri.s,_p);
context: void remove_presentity(pdomain_t* _d, struct presentity* _p){	_d->unreg(&_p->uri, &_p->uri, (void*)callback, _p);	LOG(L_DBG, "unregistering callback to %.*s, %p\n", _p->uri.len, _p->uri.s,_p);		LOG(L_DBG, "remove_presentity _p=%p p_uri=%.*s\n", _p, _p->uri.len, _p->uri.s);	slot_rem(_p->slot, _p, &_d->first, &_d->last);	/* remove presentity from database */	db_remove_presentity(_p);}