Make libvirt-style access control work when only doing RA.

src/dhcp-common.c

@@ -407,7 +407,7 @@ static int join_multicast_worker(struct in6_addr *local, int prefix,
       return 1;
 
   /* weird libvirt-inspired access control */
-  for (context = daemon->dhcp6; context; context = context->next)
+  for (context = daemon->ra_contexts; context; context = context->next)
     if (!context->interface || strcmp(context->interface, ifrn_name) == 0)
       break;
 

src/radv.c

@@ -158,7 +158,7 @@ void icmp6_packet(void)
       return;
  
   /* weird libvirt-inspired access control */
-  for (context = daemon->dhcp6; context; context = context->next)
+  for (context = daemon->ra_contexts; context; context = context->next)
     if (!context->interface || strcmp(context->interface, interface) == 0)
       break;