[HAL][UART] Avoid RTOF flag to be cleared by a transmit process in polling mode

Src/stm32l0xx_hal_uart.c

diff --git a/Src/stm32l0xx_hal_uart.c b/Src/stm32l0xx_hal_uart.c
index 83eb444..35f62f9 100644
--- a/Src/stm32l0xx_hal_uart.c
+++ b/Src/stm32l0xx_hal_uart.c
@@ -3363,7 +3363,7 @@
         return HAL_TIMEOUT;
       }
 
-      if (READ_BIT(huart->Instance->CR1, USART_CR1_RE) != 0U)
+      if ((READ_BIT(huart->Instance->CR1, USART_CR1_RE) != 0U) && (Flag != UART_FLAG_TXE) && (Flag != UART_FLAG_TC))
       {
         if (__HAL_UART_GET_FLAG(huart, UART_FLAG_ORE) == SET)
         {