Make torch checks same for both CPU and CUDA multinomial (#25595)
Summary:
Currently we have different checks for multinomial method on CPU and CUDA. This PR will make them consistent.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25595
Differential Revision: D17236163
Pulled By: ifedan
fbshipit-source-id: 7718173bdaf216e8eb636c2a5b9c5939b975325b
