src: fix C4805 MSVC warning

'==' : unsafe mix of type 'bool' and type 'int' in operation

PR-URL: https://github.com/nodejs/node/pull/39998


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>