random.c: ensure initialized

* random.c (get_rnd, try_get_rnd): ensure initialized to get rid
  of crash in forked processes.  [ruby-core:82100] [Bug #13753]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59368 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

random.c

@@ -338,7 +338,7 @@ get_rnd(VALUE obj)
 {
     rb_random_t *ptr;
     TypedData_Get_Struct(obj, rb_random_t, &random_data_type, ptr);
-    return ptr;
+    return rand_start(ptr);
 }
 
 static rb_random_t *
@@ -348,7 +348,7 @@ try_get_rnd(VALUE obj)
 	return rand_start(&default_rand);
     }
     if (!rb_typeddata_is_kind_of(obj, &random_data_type)) return NULL;
-    return DATA_PTR(obj);
+    return rand_start(DATA_PTR(obj));
 }
 
 /* :nodoc: */

test/ruby/test_rand.rb

@@ -464,6 +464,10 @@ END
     assert_fork_status(1, bug5661) {stable.rand(4)}
     r1, r2 = *assert_fork_status(2, bug5661) {stable.rand}
     assert_equal(r1, r2, bug5661)
+
+    assert_fork_status(1, '[ruby-core:82100] [Bug #13753]') do
+      Random::DEFAULT.rand(4)
+    end
   rescue NotImplementedError
   end