send ack after last message only

Streaming.cpp

@@ -58,6 +58,9 @@ namespace stream
 				else
 					break;
 			}
+
+			// send ack for last message
+			SendQuickAck ();
 		}	
 		else 
 		{	
@@ -117,7 +120,6 @@ namespace stream
 			delete packet;
 		
 		m_LastReceivedSequenceNumber = receivedSeqn;
-		SendQuickAck ();
 
 		if (flags & PACKET_FLAG_CLOSE)
 		{