Only invoke initTracing if tracing is actually enabled

tracing/tracing.go

@@ -93,6 +93,9 @@ func init() {
 }
 
 func initTracing(endpointAddr string) {
+	if !Enabled {
+		return
+	}
 	initOnce.Do(func() {
 		localEndpoint, err := openzipkin.NewEndpoint(getServiceName(), endpointAddr)
 		if err != nil {