eth/protocols/eth: replace array with counter in txn broadcaster (#23656)

eth/protocols/eth/broadcast.go

@@ -75,7 +75,7 @@ func (p *Peer) broadcastTransactions() {
 		if done == nil && len(queue) > 0 {
 			// Pile transaction until we reach our allowed network limit
 			var (
-				hashes []common.Hash
+				hashesCount uint64
 				txs         []*types.Transaction
 				size        common.StorageSize
 			)
@@ -84,9 +84,9 @@ func (p *Peer) broadcastTransactions() {
 					txs = append(txs, tx)
 					size += tx.Size()
 				}
-				hashes = append(hashes, queue[i])
+				hashesCount++
 			}
-			queue = queue[:copy(queue, queue[len(hashes):])]
+			queue = queue[:copy(queue, queue[hashesCount:])]
 
 			// If there's anything available to transfer, fire up an async writer
 			if len(txs) > 0 {