style: fix a ton of new Clippy lints (#509) #1439

Job	Run time
changed_paths	6s
rustfmt	15s
clippy	2m 43s
cargo check (host)	3m 43s
build boot image (x86_64)	3m 11s
Loom tests (cordyceps)	1m 24s
docs	4m 26s
cargo test (host)	4m 18s
cargo test (cross x64)	5m 59s
Miri tests (cordyceps)	2m 45s
Loom tests (maitake)	4m 8s
Miri tests (maitake)	32m 18s
Tests (maitake, no-default-features)	1m 32s
all_systems_go	0s
	1h 6m 48s

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