golint: remove unnecessary _ variable.

consumer.go

@@ -463,7 +463,7 @@ func (w *brokerConsumer) subscriptionConsumer() {
 			return
 		}
 
-		for child, _ := range w.subscriptions {
+		for child := range w.subscriptions {
 			block := response.GetBlock(child.topic, child.partition)
 			if block == nil {
 				child.sendError(IncompleteResponse)
@@ -483,7 +483,7 @@ func (w *brokerConsumer) updateSubscriptionCache(newSubscriptions []*PartitionCo
 		w.subscriptions[child] = none{}
 	}
 
-	for child, _ := range w.subscriptions {
+	for child := range w.subscriptions {
 		select {
 		case <-child.dying:
 			close(child.trigger)
@@ -497,7 +497,7 @@ func (w *brokerConsumer) abort(err error) {
 	_ = w.broker.Close() // we don't care about the error this might return, we already have one
 	w.consumer.client.disconnectBroker(w.broker)
 
-	for child, _ := range w.subscriptions {
+	for child := range w.subscriptions {
 		child.sendError(err)
 		child.trigger <- none{}
 	}
@@ -516,7 +516,7 @@ func (w *brokerConsumer) fetchNewMessages() (*FetchResponse, error) {
 		MaxWaitTime: int32(w.consumer.config.MaxWaitTime / time.Millisecond),
 	}
 
-	for child, _ := range w.subscriptions {
+	for child := range w.subscriptions {
 		request.AddBlock(child.topic, child.partition, child.offset, child.fetchSize)
 	}