Fixed a warning in `test_jit.py` (#21898)
Summary:
What's the point of having warnings if we never fix them :^)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21898
Differential Revision: D15873280
Pulled By: Chillee
fbshipit-source-id: a8274bab2badd840d36a9d2e1354677a6114ae1d
