move `GPIO_InitStruct` variable inside to `PIN_IRQ_ENABLE`. thanks to @mysterywolf

bsp/stm32/libraries/HAL_Drivers/drivers/drv_gpio.c

@@ -394,8 +394,6 @@ static rt_err_t stm32_pin_irq_enable(struct rt_device *device, rt_base_t pin,
     const struct pin_irq_map *irqmap;
     rt_base_t level;
     rt_int32_t irqindex = -1;
-    GPIO_InitTypeDef GPIO_InitStruct;
-    HAL_GPIO_Init(PIN_STPORT(pin), &GPIO_InitStruct);
 
     if (PIN_PORT(pin) >= PIN_STPORT_MAX)
     {
@@ -419,6 +417,7 @@ static rt_err_t stm32_pin_irq_enable(struct rt_device *device, rt_base_t pin,
         }
 
         irqmap = &pin_irq_map[irqindex];
+        GPIO_InitTypeDef GPIO_InitStruct;
 
         /* Configure GPIO_InitStructure */
         GPIO_InitStruct.Pin = PIN_STPIN(pin);
@@ -438,6 +437,7 @@ static rt_err_t stm32_pin_irq_enable(struct rt_device *device, rt_base_t pin,
             GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING_FALLING;
             break;
         }
+        HAL_GPIO_Init(PIN_STPORT(pin), &GPIO_InitStruct);
 
         HAL_NVIC_SetPriority(irqmap->irqno, 5, 0);
         HAL_NVIC_EnableIRQ(irqmap->irqno);