There is no linter warning for an async function that is not called

[mmomtchev]

There is a linter warning for not thening an async function, but nothing about a function that is never called, allowing for a much more serious problem as this one:

node/test/parallel/test-fs-promises-file-handle-read.js

Line 75 in 767070c

});

• Version: master
• Platform: All
• Subsystem: test

[mmomtchev]

Just please do not submit a PR for the unit test, I have a ready-to-merge PR with a new feature in FileHandle that fixes it