ctutils: additional clippy lints (#1384) #246

Job	Run time
test-careful	1m 20s
test-miri (s390x-unknown-linux-gnu)	1m 8s
test (stable)	1m 33s
test (1.85.0)	1m 31s
test-miri (x86_64-unknown-linux-gnu)	56s
build (1.85.0, thumbv7em-none-eabi)	14s
build (1.85.0, wasm32-unknown-unknown)	18s
build (stable, thumbv7em-none-eabi)	15s
build (stable, wasm32-unknown-unknown)	14s
	7m 29s

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