UART_debug now uses the async library with tx ring

Change-Id: I4cf689a8d3dc292201f1e2ce6c013aa1686ad6bc
diff --git a/sysmoOCTSIM/manual_test.c b/sysmoOCTSIM/manual_test.c
index 526414a..d6852bc 100644
--- a/sysmoOCTSIM/manual_test.c
+++ b/sysmoOCTSIM/manual_test.c
@@ -203,7 +203,7 @@
 	int c;
 
 	do {
-	} while (!usart_async_is_rx_not_empty(&UART_debug));
+	} while (!usart_async_rings_is_rx_not_empty(&UART_debug));
 
 	c = getchar();
 	if (c < 0)