Apply clippy fixes #1214

Job	Run time
Check io_safety feature (ubuntu-latest)	16s
Build with no-std	13s
Checking fmt and docs	31s
Build and test (ubuntu-latest, nightly)	1m 10s
Check io_safety feature (windows-latest)	34s
Build and test (ubuntu-latest, beta)	1m 10s
Check tokio02 feature	9s
Build and test (ubuntu-latest, stable)	1m 11s
Check wasm targets (nightly)	2m 44s
Build and test (ubuntu-latest, 1.63)	1m 11s
Check wasm targets (beta)	2m 48s
Cross compile (i686-unknown-linux-gnu)	1m 48s
Build and test (windows-latest, nightly)	1m 9s
Cross compile (powerpc-unknown-linux-gnu)	2m 6s
Check wasm targets (stable)	2m 39s
Build and test (windows-latest, beta)	1m 8s
Cross compile (powerpc64-unknown-linux-gnu)	2m 3s
Build and test (windows-latest, stable)	1m 8s
Cross compile (arm-linux-androideabi)	3m 30s
Build and test (windows-latest, 1.63)	1m 8s
Build and test (macOS-latest, nightly)	1m 12s
Build and test (macOS-latest, beta)	1m 9s
Build and test (macOS-latest, stable)	1m 13s
Build and test (macOS-latest, 1.63)	1m 13s
	33m 23s

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