Fix pkg/kubelet static checks

[auxten]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:

fixes pkg/kubelet static checks for

• S1039 unnecessary use of fmt.Sprintf
• S1008 simplify bool returns
• S1002 omit compares to bool
• fix capitalized error message

Which issue(s) this PR fixes:

Part of #92402

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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[draveness]

/ok-to-test

[auxten]

/assign @vishh

[SergeyKanzhelev]

there is a valid question from @BenTheElder

this file is automatically kept up to date, PRs won't merge if it's not** up to date.

are you running staticcheck using the rule in the repo or with your own install? we use a specific version in CI

fixing these warnings is making code better. However there seems to be no mechanism in place enforcing these rules. So code may degrade back. Since it's just a general code cleanup, it's lgtm

/lgtm
/priority backlog

[auxten]

there is a valid question from @BenTheElder

this file is automatically kept up to date, PRs won't merge if it's not** up to date.
are you running staticcheck using the rule in the repo or with your own install? we use a specific version in CI

fixing these warnings is making code better. However there seems to be no mechanism in place enforcing these rules. So code may degrade back. Since it's just a general code cleanup, it's lgtm

/lgtm
/priority backlog

Maybe, we should enforce strict staticcheck on every modified file on every PR. @SergeyKanzhelev

[dchen1107]

/lgtm
/approve
/milestone v1.20

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: auxten, dchen1107

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Needs approval from an approver in each of these files:

• pkg/kubelet/OWNERS [dchen1107]

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