Quartz implementation for SDL_DisplayYUVOverlay() was returning non-zero on

 error, instead of zero, contrary to documentation.

    Fixes Bugzilla #165.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401545

src/video/quartz/SDL_QuartzYUV.m

@@ -83,7 +83,7 @@ static int QZ_DisplayYUV (_THIS, SDL_Overlay *overlay, SDL_Rect *dstrect) {
         SDL_SetError ("DecompressSequenceFrameS failed");
     }
 
-    return err == noErr;
+    return err != noErr;
 }
 
 static void QZ_FreeHWYUV (_THIS, SDL_Overlay *overlay) {