Remove copy variable in goroutine loop (#1307)

Author: crossoverJie

pulsar/consumer_impl.go

@@ -385,16 +385,16 @@ func (c *consumer) internalTopicSubscribeToPartitions() error {
 	for partitionIdx := startPartition; partitionIdx < newNumPartitions; partitionIdx++ {
 		partitionTopic := partitions[partitionIdx]
 
-		go func(idx int, pt string) {
+		go func() {
 			defer wg.Done()
-			opts := newPartitionConsumerOpts(pt, c.consumerName, idx, c.options)
+			opts := newPartitionConsumerOpts(partitionTopic, c.consumerName, partitionIdx, c.options)
 			cons, err := newPartitionConsumer(c, c.client, opts, c.messageCh, c.dlq, c.metrics)
 			ch <- ConsumerError{
 				err:       err,
-				partition: idx,
+				partition: partitionIdx,
 				consumer:  cons,
 			}
-		}(partitionIdx, partitionTopic)
+		}()
 	}
 
 	go func() {
@@ -776,7 +776,6 @@ func (c *consumer) hasNext() bool {
 
 	hasNext := make(chan bool)
 	for _, pc := range c.consumers {
-		pc := pc
 		go func() {
 			defer wg.Done()
 			if pc.hasNext() {