Changed the counting so that only objects that are alive are added to the object counts.

mrbgems/mruby-objectspace/src/mruby_objectspace.c

@@ -35,11 +35,11 @@ void os_count_object_type(mrb_state *mrb, struct RBasic* obj, void *data)
 {
   struct os_count_struct* obj_count;
   obj_count = (struct os_count_struct*)(data);
-  obj_count->counts[obj->tt]++;
 
   if (is_dead(mrb, obj)) {
   	obj_count->freed++;
   } else {
+  	obj_count->counts[obj->tt]++;
   	obj_count->total++;
   }
 }