modify proto and modify p2p bug

vendor/github.com/33cn/chain33/p2p/downloadblocks.go

@@ -283,7 +283,7 @@ func (d *DownloadJob) syncDownloadBlock(peer *Peer, inv *pb.Inventory, bchan cha
 	RECV:
 		for _, item := range invdatas.Items {
 			bchan <- &pb.BlockPid{Pid: peer.GetPeerName(), Block: item.GetBlock()} //下载完成后插入bchan
-			log.Debug("download", "frompeer", peer.Addr(), "blockheight", inv.GetHeight(), "Blocksize", item.GetBlock().XXX_Size())
+			log.Debug("download", "frompeer", peer.Addr(), "blockheight", inv.GetHeight(), "Blocksize", item.GetBlock().Size())
 		}
 	}
 }