quic: remove redundant === 0n checks in kFinishClose method #124

Job	Run time
aarch64-darwin: with shared libraries	1h 51m 17s
x86_64-linux: with shared libraries	2h 21m 6s
aarch64-linux: with shared libraries	2h 26m 35s
x86_64-darwin: with shared libraries	3h 15m 51s
	9h 54m 49s

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