Minor format cleanup in py_rref.cpp

[mrshenli]

Stack from ghstack:

• Cleanup internal functions in python_functions.cpp #37536 Cleanup internal functions in python_functions.cpp
• Minor format cleanup in py_rref.cpp #37520 Minor format cleanup in py_rref.cpp
• Let RPC return FutureIValue instead of FutureMessage #37519 Let RPC return FutureIValue instead of FutureMessage

Differential Revision: D21308889

[dr-ci]

💊 Build failures summary and remediations

As of commit 9686291 (more details on the Dr. CI page):

---

• 1/1 failures possibly* introduced in this PR
  • 1/1 non-CircleCI failure(s)

---

ci.pytorch.org: 1 failed

• Failed: pr/py3.6-clang7-rocmdeb-ubuntu16.04

---

This comment was automatically generated by Dr. CI (expand for details).

Follow this link to opt-out of these comments for your Pull Requests.

Please report bugs/suggestions on the GitHub issue tracker.

See how this bot performed.

This comment has been revised 6 times.

[xush6528]

oops I added this.

[facebook-github-bot]

@mrshenli merged this pull request in 322e564.