[FX] Move none assignments to same line (#49209)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/49209
Test Plan: Imported from OSS
Reviewed By: Chillee
Differential Revision: D25484975
Pulled By: jamesr66a
fbshipit-source-id: 44207be878f95ec9420e87af79833191d5cc0c7e
