Remove unused variable (#70261)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70261
ghstack-source-id: 146310591
Test Plan:
```
buck test fbsource//xplat/caffe2:for_each_prod_ptl_model_test
```
{gif:p014gzft}
Reviewed By: iseeyuan
Differential Revision: D33265656
fbshipit-source-id: 6e303ee304064a61383ba2ae34f2e21077ec9db3
