* gc.c (rb_objspace_free): free slot itself.
* gc.c (objspace_each_objects): fix condition.
  Use slot->body instead of slot.
* gc.c (count_objects): use "slot" variable.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42023 b2dd03c8-39d4-4d8f-98ff-823fe69b080e