consumergroup example 'ErrClosedConsumerGroup error' can cause the program to hang

[dakunge]

Description

https://github.com/IBM/sarama/blob/main/examples/consumergroup/main.go#L111

this return will hang at below code，i think for loop cannot exist https://github.com/IBM/sarama/blob/main/examples/consumergroup/main.go#L132

Versions

Sarama	Kafka	Go

Configuration

Logs

logs: CLICK ME

Additional Context

[dnwe]

@dakunge whilst that's true, I thought the only way of triggering ErrClosedConsumerGroup was if the user explicitly called client.Close(), which in the example doesn't happen until after the for keepRunning { ... } loop has already exited https://github.com/IBM/sarama/blob/98ec384372ecbb9d86036c6f210f840c45dbfa70/examples/consumergroup/main.go#L146

I guess we could call cancel() before the return, just to be sure both are coordinated in shutdown

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