Quartz implementation for SDL_DisplayYUVOverlay() was returning non-zero on  error, instead of zero, contrary to documentation.
Quartz implementation for SDL_DisplayYUVOverlay() was returning non-zero on
 error, instead of zero, contrary to documentation.

    Fixes Bugzilla #165.


git-svn-id: 75429ccc2030f235ccf16e6b9b7f8e83d5edd22e@2094 c70aab31-4412-0410-b14c-859654838e24

albertz/sdl,albertz/sdl,albertz/sdl,albertz/sdl