chore: fix minor clippy lints #933

Job	Run time
Test Suite	1m 55s
Check rustdoc intra-doc links	45s
Check	1m 35s
Cross compile (armv7-unknown-linux-gnueabihf)	21s
Cross compile (powerpc64-unknown-linux-gnu)	25s
Cross compile (powerpc-unknown-linux-gnu)	12s
Rustfmt	10s
Cross compile (wasm32-unknown-unknown)	21s
Clippy	1m 16s
	7m 0s

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