Fix access control when DHCPv6 but no RA in use.

src/dhcp-common.c

@@ -407,10 +407,11 @@ static int join_multicast_worker(struct in6_addr *local, int prefix,
       return 1;
 
   /* weird libvirt-inspired access control */
-  for (context = daemon->ra_contexts; context; context = context->next)
+  for (context = daemon->ra_contexts ? daemon->ra_contexts : daemon->dhcp6; 
+       context; context = context->next)
     if (!context->interface || strcmp(context->interface, ifrn_name) == 0)
       break;
-
+  
   if (!context)
     return 1;
   

src/option.c

@@ -2952,7 +2952,7 @@ static char *one_opt(int option, char *arg, char *gen_prob, int command_line)
 	
 	if (!atoi_check(comma, &val) || 
 	    !(new->name = canonicalise_opt(arg)) ||
-	    (data && (len = parse_hex(data, (unsigned char *)data, -1, NULL, NULL)) == -1))
+	    (data && (len = parse_hex(data, (unsigned char *)data, -1, NULL, NULL)) == -1U))
 	  {
 	    problem = _("bad RR record");
 	    break;

src/radv.c

@@ -158,7 +158,8 @@ void icmp6_packet(void)
       return;
  
   /* weird libvirt-inspired access control */
-  for (context = daemon->ra_contexts; context; context = context->next)
+  for (context = daemon->ra_contexts ? daemon->ra_contexts : daemon->dhcp6; 
+       context; context = context->next)
     if (!context->interface || strcmp(context->interface, interface) == 0)
       break;