gc.c: do nothing unless USE_RGENGC

* gc.c (gc_verify_internal_consistency): always do nothing unless
  USE_RGENGC is set, no local variable needed.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45547 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

gc.c

@@ -4252,21 +4252,21 @@ verify_internal_consistency_i(void *page_start, void *page_end, size_t stride, v
 static VALUE
 gc_verify_internal_consistency(VALUE self)
 {
+#if USE_RGENGC
     struct verify_internal_consistency_struct data;
     data.objspace = &rb_objspace;
     data.err_count = 0;
 
-#if USE_RGENGC
     {
 	struct each_obj_args eo_args;
 	eo_args.callback = verify_internal_consistency_i;
 	eo_args.data = (void *)&data;
 	objspace_each_objects((VALUE)&eo_args);
     }
-#endif
     if (data.err_count != 0) {
 	rb_bug("gc_verify_internal_consistency: found internal consistency.\n");
     }
+#endif
     return Qnil;
 }