hwrev is int16_t

src/usb-device.h

@@ -44,7 +44,7 @@ struct usb_flash_device {
 
 struct usb_device_info {
 	enum device detected_device;
-	char * detected_hwrev;
+	int16_t detected_hwrev;
 	const struct usb_flash_device * flash_device;
 	usb_dev_handle * udev;
 };