Fix tabs lint. (#19196)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19196
ghimport-source-id: c10b1b19b087d7650e1614f008a9c2db21dfec2f
Differential Revision: D14913428
Pulled By: ezyang
fbshipit-source-id: 815b919d8e4516d0e5d89ebbdc4dff6d1d08da47
