SDL_GL_LoadLibrary() was returning 1, and not 0, to signify "success" on the

 Quartz target...fixed this to match the documented behaviour.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401180

src/video/quartz/SDL_QuartzGL.m

@@ -169,7 +169,7 @@ void QZ_TearDownOpenGL (_THIS) {
 
 int    QZ_GL_LoadLibrary    (_THIS, const char *location) {
     this->gl_config.driver_loaded = 1;
-    return 1;
+    return 0;
 }
 
 void*  QZ_GL_GetProcAddress (_THIS, const char *proc) {