quic: remove redundant === 0n checks in kFinishClose method #111

Job	Run time
x86_64-linux: with shared libraries	28m 20s
aarch64-darwin: with shared libraries	27m 28s
aarch64-linux: with shared libraries	24m 42s
x86_64-darwin: with shared libraries	48m 59s
	2h 9m 29s

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