etcdserver: fix shadow declaration

etcdserver/server.go

@@ -243,7 +243,9 @@ func NewServer(cfg *ServerConfig) (*EtcdServer, error) {
 			return nil, fmt.Errorf("member %s has already been bootstrapped", m.ID)
 		}
 		if cfg.ShouldDiscover() {
-			str, err := discovery.JoinCluster(cfg.DiscoveryURL, cfg.DiscoveryProxy, m.ID, cfg.InitialPeerURLsMap.String())
+			var str string
+			var err error
+			str, err = discovery.JoinCluster(cfg.DiscoveryURL, cfg.DiscoveryProxy, m.ID, cfg.InitialPeerURLsMap.String())
 			if err != nil {
 				return nil, err
 			}
@@ -277,7 +279,9 @@ func NewServer(cfg *ServerConfig) (*EtcdServer, error) {
 		if cfg.ShouldDiscover() {
 			plog.Warningf("discovery token ignored since a cluster has already been initialized. Valid log found at %q", cfg.WALDir())
 		}
-		snapshot, err := ss.Load()
+		var snapshot *raftpb.Snapshot
+		var err error
+		snapshot, err = ss.Load()
 		if err != nil && err != snap.ErrNoSnapshot {
 			return nil, err
 		}