fix clippy warning #1525

Job	Run time
Clippy	1m 27s
Build (stable)	2m 30s
Build (beta)	2m 28s
Build (nightly)	2m 16s
Build vendored (vendored-openssl, g3proxy)	2m 58s
Build vendored (vendored-openssl, g3bench)	1m 48s
Build vendored (vendored-openssl, g3tiles)	2m 22s
Build vendored (vendored-openssl, g3fcgen)	2m 35s
Build vendored (vendored-openssl, g3mkcert)	1m 32s
Build vendored (vendored-openssl, g3keymess)	1m 52s
Build vendored (vendored-tongsuo, g3proxy)	2m 27s
Build vendored (vendored-tongsuo, g3bench)	1m 38s
Build vendored (vendored-tongsuo, g3tiles)	1m 39s
Build vendored (vendored-tongsuo, g3fcgen)	1m 48s
Build vendored (vendored-tongsuo, g3mkcert)	1m 22s
Build vendored (vendored-tongsuo, g3keymess)	2m 0s
Build vendored (vendored-aws-lc, g3proxy)	3m 4s
Build vendored (vendored-aws-lc, g3bench)	2m 23s
Build vendored (vendored-aws-lc, g3tiles)	2m 48s
Build vendored (vendored-aws-lc, g3fcgen)	2m 35s
Build vendored (vendored-aws-lc, g3mkcert)	2m 42s
Build vendored (vendored-aws-lc, g3keymess)	2m 18s
Build vendored (vendored-boringssl, g3proxy)	3m 9s
Build vendored (vendored-boringssl, g3bench)	2m 46s
Build vendored (vendored-boringssl, g3tiles)	3m 16s
Build vendored (vendored-boringssl, g3fcgen)	2m 44s
Build vendored (vendored-boringssl, g3mkcert)	2m 48s
Build vendored (vendored-boringssl, g3keymess)	3m 11s
Build vendored (vendored-c-ares, g3proxy)	3m 9s
	1h 9m 35s

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