etcdctl/ctlv3: remove unnecessary 'return'
etcdctl/ctlv3: remove unnecessary 'return'

Signed-off-by: Gyu-Ho Lee <3454051ee3341eb69bdf6fca40899cdad4d86496@gmail.com>

visheshnp/etcd,mqliang/etcd,gyuho/etcd,mkumatag/etcd,mickep76/etcd,etcd-io/etcd,bluebreezecf/etcd,dannysauer/etcd,mickep76/etcd,dannysauer/etcd,glevand/coreos--etcd,etcd-io/etcd,mqliang/etcd,rnaveiras/etcd,cockroachdb/etcd,sebrandon1/etcd,rnaveiras/etcd,ajityagaty/etcd,a-robinson/etcd,xiang90/etcd,sebrandon1/etcd,YuleiXiao/etcd,bdarnell/etcd,sinsharat/etcd,li-ang/etcd,joshix/etcd,joshix/etcd,mqliang/etcd,vimalk78/etcd,whuwxl/etcd,vimalk78/etcd,mkumatag/etcd,heyitsanthony/etcd,xiang90/etcd,cockroachdb/etcd,mkumatag/etcd,bdarnell/etcd,whuwxl/etcd,YuleiXiao/etcd,heyitsanthony/etcd,gyuho/etcd,glevand/coreos--etcd,ajityagaty/etcd,a-robinson/etcd,akauppi/etcd,li-ang/etcd,rnaveiras/etcd,fanminshi/etcd,fanminshi/etcd,lorneli/etcd,etcd-io/etcd,coreos/etcd,lorneli/etcd,akauppi/etcd,visheshnp/etcd,coreos/etcd,sinsharat/etcd,bluebreezecf/etcd,ajityagaty/etcd