src: use offset calc. instead of `req->data` in node_file

A small refactor – this removes one layer of pointer indirection.
(The performance gain is likely negligible, the main point here
being that this encapsulates libuv request management a bit more.)

PR-URL: https://github.com/nodejs/node/pull/21839
Reviewed-By: Eugene Ostroukhov <eostroukhov@google.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Jon Moss <me@jonathanmoss.me>

0 files changed, 0 insertions, 0 deletions