Fix latest clippy lints #2104

Job	Run time
Docs	4m 0s
Clippy	3m 46s
Examples Rust nightly	6m 28s
Format	14s
Test forcing wrapper generation	11m 19s
Examples Rust beta	6m 30s
Outdated	14s
Examples Rust stable	5m 10s
Examples macOS	6m 18s
Address Sanitizer	17m 18s
Examples Windows (gnu)	9m 55s
Test Rust nightly	9m 34s
Examples Windows (msvc)	6m 52s
Test Rust beta	10m 1s
Test Rust stable	10m 25s
Test macOS	12m 20s
Test Windows (msvc)	15m 6s
	2h 15m 30s

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