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rfc6979: clippy cleanups #2772

Job	Run time
no_std (thumbv7em-none-eabi, stable)	59s
no_std (thumbv7em-none-eabi, 1.85.0)	1m 5s
test (stable)	29s
test (1.85.0)	35s
no_std (wasm32-unknown-unknown, stable)	1m 7s
no_std (wasm32-unknown-unknown, 1.85.0)	1m 7s
	5m 22s

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