fix golint errors

[bysph]

Signed-off-by: sph shepenghui1@huawei.com

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[k8s-ci-robot]

Hi @bysph. Thanks for your PR.

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[mszostok]

/ok-to-test

[mszostok]

Hi @bysph
Thanks for PR! :)

Maybe you are also interested to fix this issue, it's connected with your pr?
#2732

If you will need then I could assist you with that;)

[mszostok]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bysph, mszostok

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