ctutils: additional clippy lints (#1384) #2127

Job	Run time
test (stable)	29s
build (1.85.0, thumbv7em-none-eabi)	20s
minimal-versions / minimal-versions	21s
build (stable, wasm32-unknown-unknown)	13s
test (1.85.0)	16s
build (stable, thumbv7em-none-eabi)	9s
build (1.85.0, wasm32-unknown-unknown)	18s
	2m 6s

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