Http fixes potential null dereference.

 * NOTE: this might not works if we don't have the
 remote idea of our ip.
 * Let's try it with a fake local ip.
 * credits goes to coverity for this one.

Author: caeies

src/http.c

@@ -875,7 +875,10 @@ static int parse_xml_config(struct tunnel *tunnel, const char *buffer)
 		log_warn("No gateway address, using interface for routing\n");
 
 	if (tunnel->config->tun) {
-		tunnel->ipv4.ip_addr.s_addr = inet_addr(gateway);
+		if (!gateway)
+			tunnel->ipv4.ip_addr.s_addr = inet_addr("192.0.2.2");
+		else
+			tunnel->ipv4.ip_addr.s_addr = inet_addr(gateway);
 		tunnel->ipv4.peer_addr.s_addr = inet_addr("192.0.2.1");
 	}