[HAL][UART] Correct DMA Rx abort procedure impact on ongoing Tx transfer in polling mode

Src/stm32l1xx_hal_uart.c

diff --git a/Src/stm32l1xx_hal_uart.c b/Src/stm32l1xx_hal_uart.c
index 2429b38..16558a1 100644
--- a/Src/stm32l1xx_hal_uart.c
+++ b/Src/stm32l1xx_hal_uart.c
@@ -3354,7 +3354,6 @@
 {
   UART_HandleTypeDef *huart = (UART_HandleTypeDef *)((DMA_HandleTypeDef *)hdma)->Parent;
   huart->RxXferCount = 0x00U;
-  huart->TxXferCount = 0x00U;
 
 #if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
   /*Call registered error callback*/