Migrate return type void to () for native functions. (#28290)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/28290
ghstack-source-id: 92368250
Test Plan:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/28290
ghstack-source-id: 92368250
Differential Revision: D17565528
fbshipit-source-id: f4870bb9ee4f4e7c48df4d68508b512d25ed277c
