fix labs warning in THTensorMoreMath.cpp (#19760)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19760
ghimport-source-id: d0aabee8c7b881710292d468dca1537c5ea761b5
Differential Revision: D15087655
Pulled By: ljk53
fbshipit-source-id: ac133dfc2301c2a86c41b4b8f1483d7d23824e1e
