src: fix `-Wextra` warning in `WriteFileSync` #199

Job	Run time
lint-nix	1m 49s
aarch64-darwin: dependencies diff	2m 2s
x86_64-darwin: dependencies diff	5m 12s
aarch64-linux: dependencies diff	53s
x86_64-linux: dependencies diff	56s
	10m 52s

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