R1:e768a633b751

Fix various lint issues in rJX

Summary: Ref T6953.

Test Plan: `arc lint`

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T6953

Differential Revision: https://secure.phabricator.com/D11376