fileutil: avoid double preallocation
fileutil: avoid double preallocation

insequent/etcd,hongchaodeng/etcd,rnaveiras/etcd,chipironcin/etcd,rchicoli/etcd,a-robinson/etcd,sofuture/etcd,YuleiXiao/etcd,dannysauer/etcd,tguangch/etcd,luxas/etcd,li-ang/etcd,qqsun8819/etcd,etcd-io/etcd,bluebreezecf/etcd,luxas/etcd,ravigadde/etcd,OyTao/etcd_learning,wantonsolutions/dinv-etcd,a-robinson/etcd,etcd-io/etcd,mickep76/etcd,lumjjb/etcd,hongchaodeng/etcd,heyitsanthony/etcd,glycerine/etcd,bdarnell/etcd,jlamillan/etcd,rchicoli/etcd,coreos/etcd,wantonsolutions/dinv-etcd,swingbach/etcd,cockroachdb/etcd,akauppi/etcd,etcd-io/etcd,glycerine/etcd,jlamillan/etcd,lumjjb/etcd,linuxcer/etcd,tguangch/etcd,sebrandon1/etcd,qqsun8819/etcd,endocode/etcd,lorneli/etcd,whuwxl/etcd,chipironcin/etcd,linuxcer/etcd,westhood/etcd,endocode/etcd,vimalk78/etcd,ajityagaty/etcd,jonboulle/etcd,ravigadde/etcd,xiang90/etcd,ktateish/etcd,whuwxl/etcd,ajityagaty/etcd,rnaveiras/etcd,glevand/coreos--etcd,fanminshi/etcd,zaphod-concur/etcd,coreos/etcd,westhood/etcd,mickep76/etcd,dannysauer/etcd,OyTao/etcd_learning,glevand/coreos--etcd,visheshnp/etcd,nekto0n/etcd,armstrongli/etcd,handsomesun/etcd,YuleiXiao/etcd,bdarnell/etcd,fanminshi/etcd,gyuho/etcd,wantonsolutions/dinv-etcd,heyitsanthony/etcd,mqliang/etcd,rnaveiras/etcd,cockroachdb/etcd,sebrandon1/etcd,mkumatag/etcd,armstrongli/etcd,mkumatag/etcd,mqliang/etcd,xiang90/etcd,gyuho/etcd,CrazyJvm/etcd,sinsharat/etcd,bluebreezecf/etcd,joshix/etcd,plasticbox/etcd,yudai/etcd,jonboulle/etcd,purpleidea/etcd,handsomesun/etcd,joshix/etcd,plasticbox/etcd,ktateish/etcd,ajityagaty/etcd,li-ang/etcd,mkumatag/etcd,StorReduce/etcd,mqliang/etcd,sinsharat/etcd,lorneli/etcd,yudai/etcd,vimalk78/etcd,purpleidea/etcd,StorReduce/etcd,CrazyJvm/etcd,swingbach/etcd,zaphod-concur/etcd,insequent/etcd,visheshnp/etcd,nekto0n/etcd,sofuture/etcd,akauppi/etcd