[Compoments][USB]增加对class的非法注册的判断

components/drivers/usb/usbdevice/core/usbdevice.c

@@ -96,6 +96,13 @@ INIT_BOARD_EXPORT(rt_usbd_class_list_init);
 
 rt_err_t rt_usbd_class_register(udclass_t udclass)
 {
+#ifndef RT_USB_DEVICE_COMPOSITE
+    if(!rt_list_isempty(&class_list))
+    {
+        rt_kprintf("[D/USBD] If you want to use usb composite device please define RT_USB_DEVICE_COMPOSITE\n");
+        return RT_ERROR;
+    }
+#endif
     rt_list_insert_before(&class_list,&udclass->list);
     return RT_EOK;
 }
@@ -109,6 +116,11 @@ rt_err_t rt_usb_device_init(void)
     rt_list_t *i;
     udclass_t udclass;
 
+    if(rt_list_isempty(&class_list))
+    {
+        rt_kprintf("[D/USBD] No class register on usb device\n");
+        return RT_ERROR;
+    }
     /* create and startup usb device thread */
     rt_usbd_core_init();