Fix iterator invalidation in hub.cc
Fix iterator invalidation in hub.cc

lvshiling/muduo,lizj3624/http-github.com-chenshuo-muduo-,dhanzhang/muduo,guker/muduo,zouzl/muduo-learning,zouzl/muduo-learning,lizj3624/http-github.com-chenshuo-muduo-,penyatree/muduo,decimalbell/muduo,huan80s/muduo,tsh185/muduo,daodaoliang/muduo,shenhzou654321/muduo,danny200309/muduo,daodaoliang/muduo,shenhzou654321/muduo,danny200309/muduo,nestle1998/muduo,lizj3624/muduo,devsoulwolf/muduo,zhuangshi23/muduo,KingLebron/muduo,wangweihao/muduo,yunhappy/muduo,SourceInsight/muduo,june505/muduo,dhanzhang/muduo,lizj3624/http-github.com-chenshuo-muduo-,shenhzou654321/muduo,shuang-shuang/muduo,shuang-shuang/muduo,devsoulwolf/muduo,ucfree/muduo,dhanzhang/muduo,penyatree/muduo,ucfree/muduo,jxd134/muduo,westfly/muduo,kidzyoung/muduo,tsh185/muduo,westfly/muduo,jerk1991/muduo,dhanzhang/muduo,Cofyc/muduo,DongweiLee/muduo,xzmagic/muduo,SourceInsight/muduo,decimalbell/muduo,SuperMXC/muduo,mitliucak/muduo,fc500110/muduo,SuperMXC/muduo,nestle1998/muduo,lizj3624/muduo,danny200309/muduo,Cofyc/muduo,huan80s/muduo,zhanMingming/muduo,mitliucak/muduo,decimalbell/muduo,june505/muduo,floristt/muduo,lvmaoxv/muduo,ucfree/muduo,lvshiling/muduo,mitliucak/muduo,zhanMingming/muduo,KunYi/muduo,jerk1991/muduo,KingLebron/muduo,SourceInsight/muduo,devsoulwolf/muduo,zxylvlp/muduo,SourceInsight/muduo,huan80s/muduo,flyfeifan/muduo,KingLebron/muduo,wangweihao/muduo,KublaikhanGeek/muduo,jxd134/muduo,kidzyoung/muduo,xzmagic/muduo,youprofit/muduo,Cofyc/muduo,flyfeifan/muduo,decimalbell/muduo,wangweihao/muduo,lizhanhui/muduo,ywy2090/muduo,zhuangshi23/muduo,lizj3624/http-github.com-chenshuo-muduo-,floristt/muduo,pthreadself/muduo,shenhzou654321/muduo,DongweiLee/muduo,zxylvlp/muduo,floristt/muduo,fc500110/muduo,youprofit/muduo,SuperMXC/muduo,danny200309/muduo,SourceInsight/muduo,mitliucak/muduo,mitliucak/muduo,huan80s/muduo,wangweihao/muduo,lizj3624/http-github.com-chenshuo-muduo-,westfly/muduo,ucfree/muduo,lizj3624/muduo,guker/muduo,pthreadself/muduo,lizj3624/muduo,KunYi/muduo,zxylvlp/muduo,lizj3624/muduo,devsoulwolf/muduo,SuperMXC/muduo,wangweihao/muduo,huan80s/muduo,KublaikhanGeek/muduo,floristt/muduo,shenhzou654321/muduo,dhanzhang/muduo,ywy2090/muduo,KingLebron/muduo,lizhanhui/muduo,danny200309/muduo,KingLebron/muduo,SuperMXC/muduo,floristt/muduo,zouzl/muduo-learning,devsoulwolf/muduo,Cofyc/muduo,decimalbell/muduo,zhuangshi23/muduo,Cofyc/muduo,lvmaoxv/muduo,yunhappy/muduo,ucfree/muduo