Compialtion fix

src/sn_utils.c

@@ -1258,6 +1258,7 @@ static int process_udp(n2n_sn_t * sss,
     int				    i;
     uint8_t			    dec_tmpbuf[REG_SUPER_ACK_PAYLOAD_SPACE];
     int                             skip_add;
+    n2n_REGISTER_SUPER_ACK_payload_t *payload;
     
     memset(&sender, 0, sizeof(n2n_sock_t));
     sender.family = AF_INET;