[latency api] initialize latency ranges to all zero upon port creation

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@4102 0c269be4-1314-0410-8aa9-9f06e86f4224

jackd/engine.c

@@ -4196,6 +4196,8 @@ next:
 	shared->client_id = req->x.port_info.client_id;
 	shared->flags = req->x.port_info.flags;
 	shared->latency = 0;
+	shared->capture_latency.min = shared->capture_latency.max = 0;
+	shared->playback_latency.min = shared->playback_latency.max = 0;
 	shared->monitor_requests = 0;
 
 	port = &engine->internal_ports[port_id];