chuniio: use HRESULT instead of int for chuni_io_led_init()

chusanhook/chuni-dll.h

@@ -13,7 +13,7 @@ struct chuni_dll {
     void (*slider_start)(chuni_io_slider_callback_t callback);
     void (*slider_stop)(void);
     void (*slider_set_leds)(const uint8_t *rgb);
-    int (*led_init)();
+    HRESULT (*led_init)(void);
     void (*led_set_leds)(uint8_t board, uint8_t *rgb);
 };