Fix deviceCount on FakeGuardImpl. (#18745)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18745
ghimport-source-id: 3ed111efe83b3061652869e33d9b5910b7daa732
Differential Revision: D14759198
Pulled By: ezyang
fbshipit-source-id: 70a8db767f310fe0e0079c7b0693e9330d7cd472
