Fix some NVCC warnings (Part 2) (#101383)
PR #95568 enables more NVCC warnings. However, some cu files need to be modified to make building process more warning free. PR #100823 already contains some fixes. This PR aims to fix the remaining ones without breaking the codebase.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/101383
Approved by: https://github.com/zou3519
