StateMachine: trivial cleanup
StateMachine: trivial cleanup

chenwenbin928/tchannel,bunnyblue/tchannel,hustxiaoc/tchannel,bunnyblue/tchannel,RyanTech/tchannel,Zirpon/tchannel,bunnyblue/tchannel,i/tchannel,sasa233/tchannel,vanloswang/tchannel,chenwenbin928/tchannel,hustxiaoc/tchannel,sasa233/tchannel,savaki/tchannel,savaki/tchannel,sasa233/tchannel,RyanTech/tchannel,hustxiaoc/tchannel,benfleis/tchannel,i/tchannel,RyanTech/tchannel,Zirpon/tchannel,vanloswang/tchannel,benfleis/tchannel,chenwenbin928/tchannel,i/tchannel,vanloswang/tchannel,benfleis/tchannel,savaki/tchannel,Zirpon/tchannel