fix typo, minor cleanup #30

Job	Run time
Test CUDA support	36s
Test build-std (aarch64-tvos)	2m 23s
MSRV (ubuntu-latest)	20s
Rustfmt	14s
Test build-std (aarch64-tvos-sim)	2m 21s
Test (stable)	29s
MSRV (windows-latest)	39s
Test build-std (x86_64-tvos)	6m 50s
Test (beta)	27s
Test (nightly)	28s
Clippy	13s
Test (linux32)	1m 21s
Test (macos)	2m 19s
Test (aarch64-macos)	43s
Test (aarch64-ios)	1m 30s
Test (win32)	1m 16s
Test (win64)	1m 35s
Test (mingw32)	1m 22s
Test (mingw64)	1m 27s
Test (windows-2019)	1m 17s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	2m 39s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	1m 41s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	1m 32s
	33m 42s

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