Fix ivalue_inl.h:353:29: warning: comparison of unsigned expression >= 0 is always true (#32778)
Summary:
`slot` is unsigned integer which is `always >= 0`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/32778
Differential Revision: D19625789
Pulled By: ngimel
fbshipit-source-id: c92c35c65d4372be934283e87aeba99e9e0ef353
