udp: restore parallel interface functionality
@@ -591,6 +591,7 @@ int udp_create_spawner(struct netaddr laddr, udpspawn_fn_t fn,
return -ENOMEM;
trans_init_3tuple(&s->e, IPPROTO_UDP, &udp_par_ops, laddr);
+ s->fn = fn;
ret = trans_table_add(&s->e);
if (ret) {
sfree(s);
