Fix clippy warnings

[ansasaki]

Fix new warnings raised by the latest version of clippy

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.95%. Comparing base (986e7a0) to head (c17898a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
e2e-testsuite	58.95% <100.00%> (+0.02%)	⬆️
upstream-unit-tests	58.95% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
keylime-push-model-agent/src/struct_filler.rs	23.62% <ø> (ø)
keylime/src/ip_parser.rs	77.27% <100.00%> (ø)
keylime/src/list_parser.rs	85.71% <100.00%> (ø)

... and 6 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.