[HAL][UART] Add 'const' qualifier to comply to MISRA C rule 8.13

Inc/stm32f2xx_hal_uart.h

diff --git a/Inc/stm32f2xx_hal_uart.h b/Inc/stm32f2xx_hal_uart.h
index 1aecf56..8f9e7b6 100644
--- a/Inc/stm32f2xx_hal_uart.h
+++ b/Inc/stm32f2xx_hal_uart.h
@@ -775,8 +775,8 @@
   * @{
   */
 /* Peripheral State functions  **************************************************/
-HAL_UART_StateTypeDef HAL_UART_GetState(UART_HandleTypeDef *huart);
-uint32_t              HAL_UART_GetError(UART_HandleTypeDef *huart);
+HAL_UART_StateTypeDef HAL_UART_GetState(const UART_HandleTypeDef *huart);
+uint32_t              HAL_UART_GetError(const UART_HandleTypeDef *huart);
 /**
   * @}
   */

Src/stm32f2xx_hal_uart.c

diff --git a/Src/stm32f2xx_hal_uart.c b/Src/stm32f2xx_hal_uart.c
index 846ed7b..2ea1069 100644
--- a/Src/stm32f2xx_hal_uart.c
+++ b/Src/stm32f2xx_hal_uart.c
@@ -2914,7 +2914,7 @@
   *                the configuration information for the specified UART module.
   * @retval HAL state
   */
-HAL_UART_StateTypeDef HAL_UART_GetState(UART_HandleTypeDef *huart)
+HAL_UART_StateTypeDef HAL_UART_GetState(const UART_HandleTypeDef *huart)
 {
   uint32_t temp1 = 0x00U, temp2 = 0x00U;
   temp1 = huart->gState;
@@ -2929,7 +2929,7 @@
   *               the configuration information for the specified UART.
   * @retval UART Error Code
   */
-uint32_t HAL_UART_GetError(UART_HandleTypeDef *huart)
+uint32_t HAL_UART_GetError(const UART_HandleTypeDef *huart)
 {
   return huart->ErrorCode;
 }