fs: reduce redundant callback check
If options
is a function, we don't need to call maybeCallback
to check it again.
https://github.com/nodejs/node/blob/4ac170251bc44563755576d8dea1f46c715bac8d/lib/fs.js#L130-L135
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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