Fix clang warnings #2176

Job	Run time
build (clang-sanitize, ubuntu-latest)	41m 11s
build (gcc-release, ubuntu-latest)	9m 2s
conan	8m 30s
bindings	17m 3s
build (gcc-11-release, ubuntu-latest)	8m 53s
build (gcc-debug-shared, ubuntu-latest)	8m 36s
linux-coverage	15m 2s
build (gcc-debug-noexcept, ubuntu-latest)	8m 28s
build (macos-release, macos-latest)	4m 54s
build (win64-release, windows-latest)	13m 16s
build (win64-debug-shared, windows-latest)	10m 34s
build (win64-debug-noexcept, windows-latest)	9m 10s
	2h 34m 39s

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