chore: fix minor clippy lints #932

Job	Run time
Test Suite	1m 43s
Clippy	1m 11s
Rustfmt	13s
Cross compile (wasm32-unknown-unknown)	10s
Check	1m 41s
Check rustdoc intra-doc links	20s
Cross compile (powerpc64-unknown-linux-gnu)	15s
Cross compile (armv7-unknown-linux-gnueabihf)	18s
Cross compile (powerpc-unknown-linux-gnu)	17s
	6m 8s

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