Clear acktosend when initializing node

since it was never reset, values might been taken over from former node

src/d_net.c

@@ -639,6 +639,7 @@ void Net_WaitAllAckReceived(UINT32 timeout)
 static void InitNode(node_t *node)
 {
 	node->acktosend_head = node->acktosend_tail = 0;
+	memset(node->acktosend, 0, sizeof(node->acktosend));
 	node->firstacktosend = 0;
 	node->nextacknum = 1;
 	node->remotefirstack = 0;