cleanup: fix several warnings from a Clang build #252

Job	Run time
fetch-version / fetch-version	26s
build-dev-packages-arm64 / build-modern-bpf-skeleton	3m 6s
build-dev-packages-arm64 / build-wasm-package	0s
build-dev-packages-arm64 / build-musl-package	0s
build-dev-packages / build-modern-bpf-skeleton	2m 5s
build-dev-packages / build-musl-package	27m 4s
build-dev-packages-arm64 / build-macos-package	0s
build-dev-packages-arm64 / build-win32-package	0s
build-dev-packages / build-macos-package	14m 18s
build-dev-packages / build-wasm-package	4m 29s
build-dev-packages / build-win32-package	9m 11s
build-dev-packages / build-packages	21m 32s
build-dev-packages-arm64 / build-packages	37m 54s
test-dev-packages (static) / test-packages	1m 19s
test-dev-packages / test-packages	2m 14s
test-dev-packages-arm64 / test-packages	2m 50s
publish-dev-packages / publish-packages	3m 4s
publish-dev-packages / publish-packages-deb	2m 56s
build-dev-docker	0s
build-dev-docker-arm64	0s
publish-dev-docker	0s
	2h 12m 28s

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