deviceinsight/kafkactl: operations/consumergroups/consumer-group-operation.go; 58 LoC

Found a possible issue in [deviceinsight/kafkactl](https://www.github.com/deviceinsight/kafkactl) at [operations/consumergroups/consumer-group-operation.go](https://github.com/deviceinsight/kafkactl/blob/14206aab933a70124a347fa9d2d13ec7b085cc5f/operations/consumergroups/consumer-group-operation.go#L261-L318)

Below is the message reported by the analyzer for this snippet of code. Beware that the analyzer only reports the first issue it finds, so please do not limit your consideration to the contents of the below message.

> range-loop variable topic used in defer or goroutine at line 275

[Click here to see the code in its original context.](https://github.com/deviceinsight/kafkactl/blob/14206aab933a70124a347fa9d2d13ec7b085cc5f/operations/consumergroups/consumer-group-operation.go#L261-L318)

Click here to show the 58 line(s) of Go which triggered the analyzer.

```go
for _, topic := range topicsSorted {
if topic != "" {

details := make([]partitionOffset, 0, len(offsets.Blocks[topic]))

var totalLag int64 = 0

partitionChannel := make(chan partitionOffset)
errChannel := make(chan error)

for partition := range offsets.Blocks[topic] {

go func(partition int32) {

newestOffset, err := client.GetOffset(topic, partition, sarama.OffsetNewest)
if err != nil {
errChannel <- errors.Errorf("failed to get newest offset for topic %s partition %d: %v", topic, partition, err)
return
}

oldestOffset, err := client.GetOffset(topic, partition, sarama.OffsetOldest)
if err != nil {
errChannel <- errors.Errorf("failed to get oldest offset for topic %s partition %d: %v", topic, partition, err)
return
}

lead := offsets.Blocks[topic][partition].Offset - oldestOffset
lag := newestOffset - offsets.Blocks[topic][partition].Offset

if !flags.OnlyPartitionsWithLag || lag > 0 {
partitionChannel <- partitionOffset{Partition: partition, NewestOffset: newestOffset, OldestOffset: oldestOffset,
ConsumerOffset: offsets.Blocks[topic][partition].Offset, Lead: lead, Lag: lag}
} else {
partitionChannel <- partitionOffset{Partition: -1}
}
}(partition)
}

for range offsets.Blocks[topic] {
select {
case partitionOffset := <-partitionChannel:
if partitionOffset.Partition != -1 {
details = append(details, partitionOffset)
totalLag += partitionOffset.Lag
}
case err := <-errChannel:
return nil, err
}
}

sort.Slice(details, func(i, j int) bool {
return details[i].Partition < details[j].Partition
})

topicPartitions := topicPartitionOffsets{Name: topic, Partitions: details, TotalLag: totalLag}
topicPartitionList = append(topicPartitionList, topicPartitions)
}
}

```

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commit ID: 14206aab933a70124a347fa9d2d13ec7b085cc5f