fix syntax error in bfloat16 PR (#64122)
Summary:
fixes prior syntax error from PR ngimel
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64122
Reviewed By: H-Huang
Differential Revision: D30643596
Pulled By: ngimel
fbshipit-source-id: 0a2d5a40fb6dc7339cd03112e57ef0e1bf8a000e
