fix bug

node/node.go

@@ -212,11 +212,8 @@ TASK_LOOP:
 	bc := &blockchain.Blockchain{
 		Blocks: make([]*blockchain.Block, blockSize),
 	}
-	// loop to do syncing.
-	for {
-		var wg sync.WaitGroup
-		wg.Add(activePeerNumber)
 
+	wg.Add(activePeerNumber)
 	for _, configPeer := range syncConfig.peers {
 		if configPeer.err != nil {
 			continue
@@ -246,7 +243,6 @@ TASK_LOOP:
 		}(&configPeer, taskSyncQueue, bc)
 	}
 	wg.Wait()
-	}
 	return bc
 }