cleanup: fix several warnings from a Clang build #2200

Job	Run time
fetch-version / fetch-version	18s
build-dev / build-and-test	5m 30s
build-dev-minimal / build-and-test	2m 54s
build-dev-packages / build-modern-bpf-skeleton	2m 7s
build-dev-packages / build-musl-package	25m 21s
build-dev-packages / build-macos-package	10m 8s
build-dev-packages / build-wasm-package	4m 32s
build-dev-packages / build-win32-package	8m 12s
build-dev-packages / build-packages	21m 33s
check-engine-checksum	3s
check-engine-version	4s
test-dev-packages / test-packages	2m 44s
test-dev-packages (static) / test-packages	1m 16s
	1h 24m 42s

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