Suppress unsigned comparison warning (#52653)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/52653
Fixes:
```
caffe2/aten/src/ATen/native/cuda/BinaryMulDivKernel.cu(105): warning: pointless comparison of unsigned integer with zero
```
Test Plan: Sandcastle
Reviewed By: ngimel
Differential Revision: D26588918
fbshipit-source-id: b1a72cebbb7dcb516f63c7c8e2526840ed7c85d1
