etcd: modify declaring empty slices

[demoManito]

declare an empty slice to var s []int replace s :=[]int{}, https://github.com/golang/go/wiki/CodeReviewComments#declaring-empty-slices

[ahrtr]

Please fix the test failures.

[serathius]

Please consider introducing a static analysis that will prevent future regressions. I expect something already exists in golangci, just needs to be enabled in https://github.com/etcd-io/etcd/blob/main/.golangci.yaml

[ahrtr]

Please consider introducing a static analysis that will prevent future regressions. I expect something already exists in golangci, just needs to be enabled in https://github.com/etcd-io/etcd/blob/main/.golangci.yaml

Yes, let's do this in a separate PR.

@demoManito Please fix the test failures.

[demoManito]

Please consider introducing a static analysis that will prevent future regressions. I expect something already exists in golangci, just needs to be enabled in main/.golangci.yaml

Yes, let's do this in a separate PR.

@demoManito Please fix the test failures.

@ahrtr test success

[cenkalti]

I couldn't find any linter for this task in https://golangci-lint.run/usage/linters/

[ahrtr]

LGTM

Thank you @demoManito

cc @spzala @serathius @mitake to double check

[ahrtr]

The change looks safe to me, so merging it

[ahrtr]

I couldn't find any linter for this task in https://golangci-lint.run/usage/linters/

Thanks @cenkalti for the feedback.