STM32 F1: update state check in Serial after HAL update

The states definition in HAL have changed so F1 driver needs updates
accordingly (as done previously on other families)

Author: LMESTM

targets/TARGET_STM/TARGET_STM32F1/serial_api.c

@@ -750,10 +750,10 @@ void serial_tx_abort_asynch(serial_t *obj)
     // reset states
     huart->TxXferCount = 0;
     // update handle state
-    if(huart->State == HAL_UART_STATE_BUSY_TX_RX) {
-        huart->State = HAL_UART_STATE_BUSY_RX;
+    if(huart->gState == HAL_UART_STATE_BUSY_TX_RX) {
+        huart->gState = HAL_UART_STATE_BUSY_RX;
     } else {
-        huart->State = HAL_UART_STATE_READY;
+        huart->gState = HAL_UART_STATE_READY;
     }
 }
 
@@ -780,10 +780,10 @@ void serial_rx_abort_asynch(serial_t *obj)
     // reset states
     huart->RxXferCount = 0;
     // update handle state
-    if(huart->State == HAL_UART_STATE_BUSY_TX_RX) {
-        huart->State = HAL_UART_STATE_BUSY_TX;
+    if(huart->RxState == HAL_UART_STATE_BUSY_TX_RX) {
+        huart->RxState = HAL_UART_STATE_BUSY_TX;
     } else {
-        huart->State = HAL_UART_STATE_READY;
+        huart->RxState = HAL_UART_STATE_READY;
     }
 }