IPv6 PD: assume status to be Success if not present

According to the RFC3315 (section 22.13. Status Code Option),
if status code option is not present in the delegation server
reply, it will be assumed to be Success. In this particular case,
do not stop IPv6 PD state machine

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Numan Siddique <numans@ovn.org>

controller/pinctrl.c

@@ -852,12 +852,15 @@ pinctrl_parse_dhcpv6_reply(struct dp_packet *pkt_in,
                     }
                     prefix_len = ia_hdr->plen;
                     memcpy(&ipv6, &ia_hdr->ipv6, sizeof (struct in6_addr));
+                    status = true;
                 }
                 if (ntohs(in_opt->code) == DHCPV6_OPT_STATUS_CODE) {
                    struct dhcpv6_opt_status *status_hdr;
 
                    status_hdr = (struct dhcpv6_opt_status *)in_opt;
-                   status = ntohs(status_hdr->status_code) == 0;
+                   if (ntohs(status_hdr->status_code)) {
+                       status = false;
+                   }
                 }
                 size += sizeof *in_opt + ntohs(in_opt->len);
                 in_opt = (struct dhcpv6_opt_header *)(in_dhcpv6_data + size);