Fixed issue: XInput trigger source cannot be selected
Added proper close of SDL_Joystick
But still nJoy and Wiimote cannot share the same gamepad. It needs to be figured out how to do it with SDL.
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@4686 8ced0084-cf51-0410-be5f-012b33b47a6e