Fix order of operations ambiguity
Fix order of operations ambiguity

Summary: Fixes a warning about ambiguity between & and ==

Reviewed By: knekritz

Differential Revision: D17500996

fbshipit-source-id: 9a3d1da499bf25aff3d97bc3ea40bf5a1d19257d

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly