Fix clippy::needless_pass_by_ref_mut warning #3050

Job	Run time
test (stable)	3m 2s
test (no rustup)	1m 54s
test (1.26)	6m 15s
test (beta)	2m 58s
test (1.30)	4m 11s
test (nightly)	2m 45s
test (nightly, macos-latest)	2m 23s
test (1.31)	4m 34s
test (1.36)	5m 21s
test (nightly, windows-latest)	4m 23s
msrv / msrv	3m 5s
test (1.39)	5m 38s
deny / deny	16s
test (1.41)	4m 50s
miri / miri	1m 6s
release-dry-run / prepare	4s
tidy / tidy	1m 4s
release-dry-run / build (aarch64-unknown-linux-gnu)	1m 11s
release-dry-run / build (aarch64-unknown-linux-musl)	51s
release-dry-run / build (aarch64-apple-darwin, macos-12)	1m 12s
release-dry-run / build (aarch64-pc-windows-msvc, windows-2019)	1m 40s
release-dry-run / build (x86_64-unknown-linux-gnu)	44s
release-dry-run / build (x86_64-unknown-linux-musl)	53s
release-dry-run / build (x86_64-apple-darwin, macos-12)	1m 26s
release-dry-run / build (x86_64-pc-windows-msvc, windows-2019)	2m 3s
release-dry-run / build (x86_64-unknown-freebsd)	1m 18s
release-dry-run / build (universal-apple-darwin, macos-12)	1m 22s
	1h 6m 29s

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