Fix getNicknameByAddress fix.
Fix getNicknameByAddress fix.

mixminion/mixminion,reezer/mixminion,Javex/mixminion,mixminion/mixminion,Javex/mixminion,rxcomm/mixminion,reezer/mixminion,crooks/mixminion,reezer/mixminion,crooks/mixminion,rxcomm/mixminion,nmathewson/mixminion,crooks/mixminion,nmathewson/mixminion,reezer/mixminion,nmathewson/mixminion,Javex/mixminion,Javex/mixminion,rxcomm/mixminion,mixminion/mixminion,crooks/mixminion,rxcomm/mixminion,nmathewson/mixminion,mixminion/mixminion