Minor typo fix (#42731)
Summary:
Just fixed a typo in test/test_sparse.py
Pull Request resolved: https://github.com/pytorch/pytorch/pull/42731
Reviewed By: ezyang
Differential Revision: D22999930
Pulled By: mrshenli
fbshipit-source-id: 1b5b21d7cb274bd172fb541b2761f727ba06302c
