Fix lint in test_utils.py (#17944)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17944
ghimport-source-id: 5b45086428b5a36e737882c78f285141121fd1bc
Stack:
* **#17944 Fix lint in test_utils.py**
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Differential Revision: D14430132
fbshipit-source-id: b00de7b4c685645ad5a4dc8c5fe6ce7e1893a3eb
