load.c: use ruby_sized_xfree for calloc-ed RArray VALUE

IMHO, this increases readability, too, since it's not
immediately clear that the object is on the malloc heap
and not a regular Ruby object.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63483 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

load.c

@@ -258,7 +258,7 @@ loaded_features_index_clear_i(st_data_t key, st_data_t val, st_data_t arg)
     VALUE obj = (VALUE)val;
     if (!SPECIAL_CONST_P(obj)) {
 	rb_ary_free(obj);
-	xfree((void *)obj);
+	ruby_sized_xfree((void *)obj, sizeof(struct RArray));
     }
     return ST_DELETE;
 }