readability tweak

plugins/inputs/kafka_consumer_legacy/kafka_consumer_legacy_test.go

@@ -125,12 +125,10 @@ func TestRunParserAndGatherJSON(t *testing.T) {
 	k.acc = &acc
 	defer close(k.done)
 
-	config := &parsers.Config{
+	k.parser, _ = parsers.NewParser(&parsers.Config{
 		DataFormat: "json",
 		MetricName: "kafka_json_test",
-	}
-
-	k.parser, _ = parsers.NewParser(config)
+	})
 	go k.receiver()
 	in <- saramaMsg(testMsgJSON)
 	acc.Wait(1)