Fix weird think-o in processingthread code
Fix weird think-o in processingthread code

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