[v6.x backport] test: improve flaky test-listen-fd-ebadf.js
Find an invalid file descriptor rather than assuming 42 will be invalid.
PR-URL: https://github.com/nodejs/node/pull/17797 Fixes: https://github.com/nodejs/node/issues/17762 Reviewed-By: Gibson Fahnestock gibfahn@gmail.com Reviewed-By: James M Snell jasnell@gmail.com Reviewed-By: Khaidi Chu i@2333.moe Reviewed-By: Luigi Pinca luigipinca@gmail.com Reviewed-By: Ruben Bridgewater ruben@bridgewater.de
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
test