style: changed variable type

include/zh_pcf8574.h

@@ -113,7 +113,7 @@ extern "C"
     typedef struct
     {
         uint8_t i2c_address;               /*!< The i2c address of PCF8574 expander that caused the interrupt. */
-        uint8_t gpio_number; /*!< The GPIO that caused the interrupt. */
+        zh_pcf8574_gpio_num_t gpio_number; /*!< The GPIO that caused the interrupt. */
         bool gpio_level;                   /*!< The GPIO level that caused the interrupt. */
     } zh_pcf8574_event_on_isr_t;