delfunc
addrtree_create(addrlen_t max_depth, void (*delfunc)(void *, void *),
log_assert(delfunc != NULL);
tree->delfunc = delfunc;
tree->delfunc(tree->env, node->elem);
addrtree_create(addrlen_t max_depth, void (*delfunc)(void *, void *),
void (*delfunc)(void *, void *);
cfg->max_client_subnet_ipv4, &delfunc,
cfg->max_client_subnet_ipv6, &delfunc,