Removes trailing whitespace (#53728)
Summary:
Fixes
```
Run (! git grep -I -l ' $' -- . ':(exclude)**/contrib/**' ':(exclude)third_party' || (echo "The above files have trailing spaces; please remove them"; false))
aten/src/ATen/native/cuda/BatchLinearAlgebra.cu
The above files have trailing spaces; please remove them
Error: Process completed with exit code 1.
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/53728
Reviewed By: ngimel
Differential Revision: D26953099
Pulled By: mruberry
fbshipit-source-id: 5f1ed2cd767de49447fcbd8e03cb3af7841cbcaf
