style: simplify some statements for readability #2509

Job	Run time
msrv	2m 14s
rustfmt	5s
test (stable, ubuntu-latest, stable)	3m 46s
miri-regex-automata	14m 54s
test (stable-32, ubuntu-latest, stable, i686-unknown-linux-gnu)	2m 37s
testfull-regex	3m 52s
test (stable-powerpc64, ubuntu-latest, stable, powerpc64-unknown-linux-gnu)	7m 43s
testfull-regex-automata	8m 30s
test (stable-s390x, ubuntu-latest, stable, s390x-unknown-linux-gnu)	9m 13s
testfull-regex-capi	21s
test (beta, ubuntu-latest, beta)	3m 51s
testfull-regex-syntax	1m 51s
test (nightly, ubuntu-latest, nightly)	2m 56s
test (macos, macos-latest, stable)	2m 32s
test (win-msvc, windows-latest, stable)	6m 19s
test (win-gnu, windows-latest, stable-x86_64-gnu)	3m 18s
	1h 14m 2s

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