Some clippy fixes #911

Job	Run time
Test aarch64-apple-tvos	3m 57s
Test CUDA support	28s
Rustfmt	11s
MSRV (ubuntu-latest)	27s
MSRV (windows-latest)	40s
Test (stable)	41s
Test (beta)	24s
Test (nightly)	23s
Test (linux32)	45s
Test (macos)	1m 20s
Test (aarch64-ios)	1m 10s
Test (win32)	1m 20s
Test (win64)	1m 44s
Test (mingw32)	1m 3s
Test (mingw64)	1m 43s
Test (windows-2019)	1m 19s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	1m 50s
	19m 25s

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