Fix clippy::unnecessary_map_or warning #2831

Job	Run time
test (stable)	1m 51s
test-llvm (14)	1m 47s
test (beta)	1m 58s
test-llvm (15)	1m 45s
test (nightly)	3m 1s
test-llvm (16)	2m 33s
test (nightly, macos-latest)	3m 45s
test-llvm (17)	1m 59s
test (nightly, windows-latest)	5m 29s
test-llvm (18)	53s
miri / miri	2m 14s
test-llvm (19)	1m 6s
deny / deny	18s
release-dry-run / prepare	5m 7s
msrv / msrv	6m 22s
tidy / tidy	1m 31s
release-dry-run / build (aarch64-unknown-linux-gnu)	1m 48s
release-dry-run / build (aarch64-unknown-linux-musl)	1m 10s
release-dry-run / build (aarch64-apple-darwin, macos-12)	1m 46s
release-dry-run / build (x86_64-unknown-linux-gnu)	55s
release-dry-run / build (x86_64-unknown-linux-musl)	1m 21s
release-dry-run / build (x86_64-apple-darwin, macos-12)	1m 49s
release-dry-run / build (x86_64-pc-windows-msvc, windows-2019)	3m 1s
release-dry-run / build (x86_64-unknown-freebsd)	1m 42s
release-dry-run / build (universal-apple-darwin, macos-12)	2m 15s
	57m 26s

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