nsqd: discard old channel references
nsqd: discard old channel references

when the channels for a topic *shrinks* we weren't
correctly discarding the pointer to the deleted
channel

szqh97/nsq,w4ngyi/nsq,coderhaoxin/nsq,coderhaoxin/nsq,myhongkongzhen/nsq,kevinc0825/nsq,beni55/nsq,CrazyJvm/nsq,mashuai/nsq,bo406/nsq,chaosue/nsq,absolute8511/nsq,kesutton/nsq,ploxiln/nsq,mikeqian/nsq,wmydz1/nsq,ShinichR/nsq,nsqio/nsq,mikeqian/nsq,wmydz1/nsq,mashuai/nsq,jehiah/nsq,absolute8511/nsq,w4ngyi/nsq,CrazyJvm/nsq,szqh97/nsq,nsqio/nsq,wuxu92/nsq,ploxiln/nsq,seanluo/nsq_with_note,nieanan/nsq,gaowenbin/nsq,nieanan/nsq,dmarkham/nsq,xiexingguang/nsq,msn217/nsq,rpau/nsq,shanemhansen/nsq,yh453926638/nsq,coderhaoxin/nsq,ShinichR/nsq,mashuai/nsq,myhongkongzhen/nsq,lcp0578/nsq,xiexingguang/nsq,lcp0578/nsq,yh453926638/nsq,absolute8511/nsq,sparklxb/nsq,kesutton/nsq,nieanan/nsq,chaosue/nsq,nsqio/nsq,Dieterbe/nsq,kesutton/nsq,nsqio/nsq,kevinc0825/nsq,qinlodestar/nsq,gaowenbin/nsq,lytics/nsq,chaosue/nsq,jlr52/nsq,mikeqian/nsq,yh453926638/nsq,bitly/nsq,sparklxb/nsq,handsomesun/nsq,CrazyJvm/nsq,youxidev/nsq,shanemhansen/nsq,philipbo/nsq,myhongkongzhen/nsq,w4ngyi/nsq,dmarkham/nsq,msn217/nsq,svmehta/nsq,ploxiln/nsq,bo406/nsq,propellerads/nsq,jehiah/nsq,philipbo/nsq,mashuai/nsq,MadBomber/nsq,OlafRadicke/nsq,jmptrader/nsq,19hz/nsq,sparklxb/nsq,gaowenbin/nsq,judwhite/nsq-0.3.2-win,kesutton/nsq,ShinichR/nsq,wuxu92/nsq,msn217/nsq,chaosue/nsq,bitly/nsq,mreiferson/nsq,wmydz1/nsq,wuxu92/nsq,jlr52/nsq,jlr52/nsq,qinlodestar/nsq,seanluo/nsq_with_note,sunminghong/nsq,myhongkongzhen/nsq,OlafRadicke/nsq,MadBomber/nsq,bo406/nsq,w3hacker/nsq,qinlodestar/nsq,propellerads/nsq,jehiah/nsq,ploxiln/nsq,handsomesun/nsq,mynameisfiber/nsq,rpau/nsq,ploxiln/nsq,Dieterbe/nsq,msn217/nsq,magastzheng/nsq,jlr52/nsq,moander/nsq,ShinichR/nsq,jsocol/nsq,youxidev/nsq,szqh97/nsq,MadBomber/nsq,philipbo/nsq,handsomesun/nsq,19hz/nsq,mreiferson/nsq,jlr52/nsq,coderhaoxin/nsq,rpau/nsq,handsomesun/nsq,chrislusf/nsq,propellerads/nsq,moander/nsq,tophymastery/nsq,judwhite/nsq-0.3.2-win,menghan/nsq,19hz/nsq,beni55/nsq,bo406/nsq,beni55/nsq,wmydz1/nsq,nimmen/nsq,qinlodestar/nsq,mikedewar/nsq,xiexingguang/nsq,bitly/nsq,MadBomber/nsq,mikeqian/nsq,yh453926638/nsq,szqh97/nsq,pombredanne/nsq,OlafRadicke/nsq,MadBomber/nsq,xuzhaokui/nsq,jehiah/nsq,Dieterbe/nsq,mreiferson/nsq,sunminghong/nsq,jsocol/nsq,chaosue/nsq,Dieterbe/nsq,jmptrader/nsq,beni55/nsq,dinedal/nsq,coderhaoxin/nsq,pombredanne/nsq,sparklxb/nsq,nimmen/nsq,youxidev/nsq,mikeqian/nsq,magastzheng/nsq,CrazyJvm/nsq,absolute8511/nsq,chrisroberts/nsq,moander/nsq,mikedewar/nsq,szqh97/nsq,elubow/nsq,xiexingguang/nsq,ShinichR/nsq,judwhite/nsq-0.3.2-win,myhongkongzhen/nsq,tophymastery/nsq,nsqio/nsq,lcp0578/nsq,w4ngyi/nsq,menghan/nsq,gaowenbin/nsq,msn217/nsq,mynameisfiber/nsq,qinlodestar/nsq,jehiah/nsq,xiexingguang/nsq,jmptrader/nsq,dinedal/nsq,wmydz1/nsq,w4ngyi/nsq,bitly/nsq,bo406/nsq,chrislusf/nsq,philipbo/nsq,lytics/nsq,absolute8511/nsq,rpau/nsq,handsomesun/nsq,w3hacker/nsq,kevinc0825/nsq,Dieterbe/nsq,xuzhaokui/nsq,svmehta/nsq,mreiferson/nsq,mikedewar/nsq,philipbo/nsq,yh453926638/nsq,lcp0578/nsq,bitly/nsq,lcp0578/nsq,chrisroberts/nsq,mreiferson/nsq,magastzheng/nsq,xuzhaokui/nsq,elubow/nsq,sparklxb/nsq,gaowenbin/nsq,mashuai/nsq,rpau/nsq,CrazyJvm/nsq,chrislusf/nsq,beni55/nsq,kesutton/nsq