fix erroneously reported 0.0.0.0 address when bridging from ipv6

daemon/call.c

@@ -2865,7 +2865,8 @@ static int call_stream_address4(char *o, struct packet_stream *ps, enum stream_a
 		l = 4;
 	}
 
-	if (!in6_to_4(&ps->advertised_endpoint.ip46) && !is_trickle_ice_address(&ps->advertised_endpoint)) {
+	if (is_addr_unspecified(&ps->advertised_endpoint.ip46)
+			&& !is_trickle_ice_address(&ps->advertised_endpoint)) {
 		strcpy(o + l, "0.0.0.0");
 		l += 7;
 	}