src: fix warn_unused_result compiler warning
../src/node_file.cc:386:7: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
Refs: https://github.com/nodejs/node/pull/31972
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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