Fix clippy lint #14

Job	Run time
Test build-std (aarch64-tvos)	1m 52s
Test build-std (aarch64-tvos-sim)	1m 41s
Clippy	18s
Test CUDA support	36s
MSRV (ubuntu-latest)	1m 56s
Test build-std (x86_64-tvos)	1m 51s
MSRV (windows-latest)	41s
Rustfmt	8s
semver-checks	9s
MSRV (macos-latest)	2m 1s
Test (stable)	1m 6s
Test (beta)	1m 11s
Test (nightly)	1m 11s
Test (linux32)	1m 24s
Test (macos)	2m 21s
Test (aarch64-macos)	1m 25s
Test (aarch64-ios)	57s
Test (win32)	2m 40s
Test (win64)	2m 36s
Test (mingw32)	2m 49s
Test (mingw64)	2m 47s
Test (windows-2019)	2m 38s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	3m 22s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	2m 54s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	3m 34s
	44m 8s

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