SDL_PushEvent() now returns values as documented.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40384

src/events/SDL_events.c

@@ -392,7 +392,7 @@ int SDL_WaitEvent (SDL_Event *event)
 
 int SDL_PushEvent(SDL_Event *event)
 {
-	return(SDL_PeepEvents(event, 1, SDL_ADDEVENT, 0));
+	return((SDL_PeepEvents(event, 1, SDL_ADDEVENT, 0) == 0) ? -1 : 0);
 }
 
 void SDL_SetEventFilter (SDL_EventFilter filter)