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blake2: fixup rustc 1.78 warnings (#580) #1138

Job	Run time
minimal-versions / minimal-versions	3m 26s
set-msrv / set-msrv	2s
build (1.71.0, thumbv7em-none-eabi)	25s
build (1.71.0, wasm32-unknown-unknown)	27s
cross (1.71.0, aarch64-unknown-linux-gnu, default)	1m 10s
build (stable, thumbv7em-none-eabi)	19s
test (1.71.0)	3m 56s
cross (1.71.0, powerpc-unknown-linux-gnu, default)	1m 35s
test (stable)	3m 46s
cross (stable, aarch64-unknown-linux-gnu, default)	1m 16s
cross (stable, powerpc-unknown-linux-gnu, default)	1m 36s
build (stable, wasm32-unknown-unknown)	19s
	18m 17s

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