revisit `RARRAY_PTR()`.

* ext/fiddle/function.c (initialize): use RARRAY_AREF() instead of
  using RARRAY_PTR().


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64989 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/fiddle/function.c

@@ -113,7 +113,7 @@ initialize(int argc, VALUE argv[], VALUE self)
     Check_Max_Args("args", len);
     ary = rb_ary_subseq(args, 0, len);
     for (i = 0; i < RARRAY_LEN(args); i++) {
-	VALUE a = RARRAY_PTR(args)[i];
+	VALUE a = RARRAY_AREF(args, i);
 	int type = NUM2INT(a);
 	(void)INT2FFI_TYPE(type); /* raise */
 	if (INT2FIX(type) != a) rb_ary_store(ary, i, INT2FIX(type));