Fix "pointless comparison" warning (#47876)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/47876
Fixes a pointless comparison against zero warning that arises for some scalar types
Test Plan:
Arises with
```
buck test mode/dev-nosan //caffe2/torch/fb/sparsenn:gpu_test -- test_prior_correction_calibration_prediction_binary
```
Reviewed By: ngimel
Differential Revision: D24925955
fbshipit-source-id: 56bcf32aeb164b078d537dd5d7c28a52bd7b66de
