Fix clippy::zombie_processes warning #650

Job	Run time
clippy	12s
msrv (ubuntu-latest, 1.63)	57s
test-android (nightly, aarch64-linux-android)	2m 2s
msrv (windows-latest, 1.63)	1m 20s
test (ubuntu-latest, nightly)	29s
test (ubuntu-latest, beta)	28s
test (ubuntu-latest, stable)	23s
test (windows-latest, nightly)	54s
test (windows-latest, beta)	47s
test (windows-latest, stable)	1m 49s
test (macos-latest, nightly)	26s
test (macos-latest, beta)	25s
test (macos-latest, stable)	20s
fmt / fmt	4s
security_audit / security_audit	2m 41s
	13m 17s

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