This slightly refactors read by moving side effects out of
howMuchToRead().
We don't actually have to set state.needReadable = true; in
howMuchToRead() since read handles 0 return as needReadable.
PR-URL: https://github.com/nodejs/node/pull/29155
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>