Fix lint in /pkg/util/iptables

[gkarthiks]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:

/kind api-change
/kind bug

/kind cleanup

/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
This PR fixes the golint errors under the /pkg/util/iptables package

Which issue(s) this PR fixes:

Fixes #68026

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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[k8s-ci-robot]

Hi @gkarthiks. Thanks for your PR.

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[gkarthiks]

/assign @eparis

[eparis]

/ok-to-test
/lgtm

[eparis]

/approve

[eparis]

/lgtm

[fejta]

/lgtm
/approve

[thockin]

Thanks!

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: eparis, fejta, gkarthiks, thockin

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• hack/OWNERS [eparis,fejta,thockin]
• pkg/util/iptables/OWNERS [eparis,thockin]

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