A BufferCallback was created but never deleted in AsyncSocketTest2
A BufferCallback was created but never deleted in AsyncSocketTest2

Summary: This crashes unit test with asan, since we never deletes it.

Reviewed By: djwatson

Differential Revision: D3622847

fbshipit-source-id: f7ea7c4f464843353b24a59adefd5d66b95bc169

Orvid/folly,rklabs/folly,Orvid/folly,floxard/folly,Orvid/folly,facebook/folly,charsyam/folly,rklabs/folly,facebook/folly,rklabs/folly,facebook/folly,floxard/folly,floxard/folly,charsyam/folly,floxard/folly,charsyam/folly,facebook/folly,charsyam/folly,Orvid/folly,floxard/folly,Orvid/folly,rklabs/folly,rklabs/folly,facebook/folly