chore: Enable lint var name.

[liangyuanpeng]

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[k8s-ci-robot]

Hi @liangyuanpeng. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[ivanvc]

Hi @liangyuanpeng, I see that you started working on addressing the warnings from this linter. However, the work required is rather large (I have addressed all of them, but after discussing this with the team on March 7th's community meeting, they decided to split addressing this into subtasks, which I'm already doing) and tracked in #17578.

However, would you be interested in working on enabling unexported-return?

[liangyuanpeng]

@ivanvc I'm not focusing on that right now, thank you for working on this and explain it.