Get the USB product ID of an opened joystick, if available.
Uint16 SDL_JoystickGetProduct(SDL_Joystick *joystick);
|joystick||the SDL_Joystick obtained from SDL_JoystickOpen()|
Returns the USB product ID of the selected joystick, or 0 if unavailable.
If the product ID isn't available this function returns 0.
This function is available since SDL 2.0.6.