PMM-7 Fix prealloc linter warnings

[maxkondr]

PMM-7

[maxkondr]

@copilot review

[Copilot]

@copilot review

I reviewed the current PR diff against PMM-7-linter-fixes and didn’t find any actionable high-confidence issues to fix.

[it-percona-cla]

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1 out of 2 committers have signed the CLA.

✅ maxkondr
❌ Copilot
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