Add explicit return in the default case (#1250)
Add explicit return in the default case (#1250)

Summary:
Fixes cases where control would reach the end of the setThreadName function without an explicit return
Pull Request resolved: https://github.com/facebook/folly/pull/1250

Reviewed By: Orvid

Differential Revision: D18222073

Pulled By: yfeldblum

fbshipit-source-id: 09cbefcc7e2ca80a95d61a4394ed74be8ea8ec55

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