Get the USB product ID of a joystick, if available.
int device_index);Uint16 SDL_JoystickGetDeviceProduct(
the index of the joystick to query (the N'th joystick on the system
Returns the USB product ID of the selected joystick. If called on an invalid index, this function returns zero
This can be called before any joysticks are opened. If the product ID isn't available this function returns 0.