add not-very-much-better clippy fix #1121

Job	Run time
Reject trailing whitespace	5s
Build test artifacts	7m 40s
cargo-checkmate / Cache checkmate	4s
cargo-checkmate / Cargo checkmate (build)	6m 32s
cargo-checkmate / Cargo checkmate (check)	5m 54s
cargo-checkmate / Cargo checkmate (clippy)	5m 6s
cargo-checkmate / Cargo checkmate (doc)	8m 39s
cargo-checkmate / Cargo checkmate (format)	11s
Run tests (1)	5m 12s
Run tests (2)	6m 25s
Run tests (3)	4m 17s
Run tests (4)	6m 3s
Run tests (5)	8m 23s
Run tests (6)	9m 0s
Run tests (7)	4m 46s
Run tests (8)	4m 11s
	1h 22m 28s

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