Fix a bug in the SOCKS logic.
Fix a bug in the SOCKS logic.

An assertion would trigger when the destination of a SOCKS connection
sent us data before obfsproxy (for example, an SSH server sends data
before the client does).

infinity0/obfsproxy,NullHypothesis/obfsproxy,qdzheng/obfsproxy,masterkorp/obfsproxy,Yawning/obfsproxy,Yawning/obfsproxy-wfpadtools,sunsong/obfsproxy,catinred2/obfsproxy,david415/obfsproxy,isislovecruft/obfsproxy