crate: fix latest clippy nightly complains #1031

Job	Run time
build (nightly) / rust	16s
build (stable) / rust	17s
build (msrv) / rust	17s
tests with miri (nightly) / rust	1m 26s
build no_std (nightly) / rust	27s
style (nightly) / rust	25s
build no_std (msrv) / rust	19s
style (msrv) / rust	24s
build no_std (stable) / rust	15s
build no_std (stable) [w/o builder] / rust	13s
build no_std (stable) [Windows] / rust	1m 44s
style (stable) / rust	28s
	6m 31s

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