Decrement ref counter only once on key object free #112

Job	Run time
unix (ubuntu-22.04)	33s
unix (ubuntu-22.04)	33s
unix (ubuntu-20.04)	28s
unix (ubuntu-20.04)	28s
unix (macOS-latest, openssl@3)	1m 48s
unix (macOS-latest, openssl@3)	1m 51s
windows (x86, WIN32)	9m 44s
windows (x86, WIN32)	9m 44s
unix (macOS-latest, [email protected])	1m 20s
unix (macOS-latest, [email protected])	1m 20s
windows (x64, WIN64)	9m 44s
windows (x64, WIN64)	9m 44s
	47m 17s

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