style: clean up some recent lint violations #2150

Job	Run time
msrv	3m 27s
test (stable, ubuntu-latest, stable)	3m 48s
miri-regex-automata	7m 15s
test (stable-32, ubuntu-latest, stable, i686-unknown-linux-gnu)	2m 53s
rustfmt	6s
testfull-regex	3m 38s
testfull-regex-automata	8m 31s
test (stable-powerpc64, ubuntu-latest, stable, powerpc64-unknown-linux-gnu)	7m 27s
test (stable-s390x, ubuntu-latest, stable, s390x-unknown-linux-gnu)	9m 2s
testfull-regex-syntax	2m 9s
testfull-regex-capi	36s
test (beta, ubuntu-latest, beta)	3m 46s
test (nightly, ubuntu-latest, nightly)	3m 52s
test (macos, macos-latest, stable)	7m 17s
test (win-msvc, windows-latest, stable)	6m 52s
test (win-gnu, windows-latest, stable-x86_64-gnu)	3m 38s
	1h 14m 17s

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