netdb: A few build fixes

libs/libc/netdb/lib_dnsaddserver.c

@@ -147,8 +147,7 @@ int dns_add_nameserver(FAR const struct sockaddr *addr, socklen_t addrlen)
   else
 #endif
     {
-      nerr("ERROR: Unsupported family: %d\n",
-            g_dns_server.addr.sa_family);
+      nerr("ERROR: Unsupported family: %d\n", addr->sa_family);
       ret = -ENOSYS;
       goto errout;
     }

libs/libc/netdb/lib_dnsforeach.c

@@ -224,7 +224,7 @@ int dns_foreach_nameserver(dns_callback_t callback, FAR void *arg)
               else
 #endif
                 {
-                  nerr("ERROR: Unrecognized address: %s\n", addrstr)
+                  nerr("ERROR: Unrecognized address: %s\n", addrstr);
                   ret = OK;
                 }
 #ifdef CONFIG_NET_IPv6