test/timeouts: improve error check
test/timeouts: improve error check

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