fix ci clippy check #529

Job	Run time
test (x86_64-unknown-linux-gnu, stable)	12s
test (x86_64-unknown-linux-gnu, nightly)	19s
test (i686-unknown-linux-gnu, stable)	21s
test (i686-unknown-linux-gnu, nightly)	30s
test (aarch64-unknown-linux-gnu, stable)	20s
test (aarch64-unknown-linux-gnu, nightly)	21s
test (armv7-unknown-linux-gnueabihf, stable)	16s
test (armv7-unknown-linux-gnueabihf, nightly)	27s
test (riscv64gc-unknown-linux-gnu, stable)	20s
test (riscv64gc-unknown-linux-gnu, nightly)	27s
test (s390x-unknown-linux-gnu, stable)	21s
test (s390x-unknown-linux-gnu, nightly)	22s
test (x86_64-apple-darwin, stable)	32s
test (x86_64-apple-darwin, nightly)	38s
test (aarch64-apple-darwin, stable)	20s
test (aarch64-apple-darwin, nightly)	21s
	6m 7s

Provide feedback