changes from feedback

Author: devnexen

ext/standard/pack.c

@@ -980,7 +980,7 @@ PHP_FUNCTION(unpack)
 						zend_long ipos, opos;
 
 
-						if (ZEND_LONG_INT_OVFL((zend_long)size * 2)) {
+						if (size > INT_MAX / 2) {
 							zend_string_release(real_name);
 							zend_argument_value_error(1, "repeater must be less than or equal to %d", INT_MAX / 2);
 							RETURN_THROWS();

ext/standard/tests/strings/gh15613.phpt

@@ -1,9 +1,5 @@
 --TEST--
 GH-15613 overflow on hex strings repeater value
---SKIPIF--
-<?php
-if (PHP_INT_SIZE != 8) die("skip this test is for 64bit platform only");
-?>
 --INI--
 memory_limit=-1
 --FILE--