There is no need to call `setupPortReferencing` in `setupChild`
as which has been called with the same arguments in the `oninit`
prototype method of `MessagePort`.
PR-URL: https://github.com/nodejs/node/pull/22298
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
