Fix Clippy warnings #934

Job	Run time
Clippy	19s
Check (aarch64-apple-ios)	25s
Check (aarch64-linux-android)	24s
Check (x86_64-apple-darwin)	22s
Check (x86_64-unknown-fuchsia)	20s
Check (x86_64-pc-windows-msvc)	24s
Check (x86_64-pc-solaris)	39s
Check (x86_64-unknown-freebsd)	25s
Check (x86_64-unknown-illumos)	35s
Check (x86_64-unknown-linux-gnu)	24s
Check (x86_64-unknown-linux-musl)	23s
Check (x86_64-unknown-netbsd)	29s
Check (x86_64-unknown-redox)	24s
Check (armv7-linux-androideabi)	27s
Check (i686-linux-android)	22s
Rustfmt	21s
Docs (aarch64-apple-ios)	20s
Docs (aarch64-linux-android)	20s
Docs (x86_64-apple-darwin)	25s
Docs (x86_64-unknown-fuchsia)	24s
Docs (x86_64-pc-windows-msvc)	20s
Docs (x86_64-pc-solaris)	20s
Docs (x86_64-unknown-freebsd)	16s
Docs (x86_64-unknown-illumos)	30s
Docs (x86_64-unknown-linux-gnu)	16s
Docs (x86_64-unknown-linux-musl)	18s
Docs (x86_64-unknown-netbsd)	19s
Docs (x86_64-unknown-redox)	17s
Docs (armv7-linux-androideabi)	21s
Docs (i686-linux-android)	17s
Test (stable)	30s
Test (1.63.0)	3m 11s
Test (beta)	30s
Test (nightly)	26s
Test (macos)	47s
Test (windows)	1m 16s
	18m 6s

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