Fix shadow in AsyncUDPSocketTest
Fix shadow in AsyncUDPSocketTest

Summary: Fix shadown warning for xplat builds

Reviewed By: yfeldblum

Differential Revision: D7811636

fbshipit-source-id: 609b5acaca3cfdd11059ed1ebbaa969e281487a2

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