Apply clippy fixes #1208

Job	Run time
Build with no-std	12s
Check tokio02 feature	10s
Check io_safety feature (ubuntu-latest)	9s
Check io_safety feature (windows-latest)	39s
Checking fmt and docs	29s
Check wasm targets (nightly)	34s
Build and test (ubuntu-latest, nightly)	1m 14s
Check wasm targets (beta)	35s
Cross compile (i686-unknown-linux-gnu)	1m 49s
Build and test (ubuntu-latest, beta)	1m 39s
Check wasm targets (stable)	31s
Cross compile (powerpc-unknown-linux-gnu)	2m 5s
Build and test (ubuntu-latest, stable)	1m 47s
Cross compile (powerpc64-unknown-linux-gnu)	2m 1s
Build and test (windows-latest, nightly)	2m 52s
Cross compile (arm-linux-androideabi)	3m 25s
Build and test (windows-latest, beta)	2m 47s
Build and test (windows-latest, stable)	2m 37s
Build and test (macOS-latest, nightly)	1m 10s
Build and test (macOS-latest, beta)	1m 9s
Build and test (macOS-latest, stable)	1m 23s
	29m 17s

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