[trivial] fix incorrect return type in test
[trivial] fix incorrect return type in test

Summary: not interesting

Reviewed By: ezgicicek

Differential Revision: D38248589

fbshipit-source-id: cd5cf117b004977c038ae190d8bb7dc185e95271

facebook/infer,facebook/infer,facebook/infer,facebook/infer,facebook/infer,facebook/infer,facebook/infer