#23440 update identical condition

Author: kiudzung

app/code/Magento/Sales/Model/Order/CreditmemoFactory.php

@@ -147,7 +147,7 @@ protected function canRefundItem($item, $qtys = [], $invoiceQtysRefundLimits = [
         if ($item->isDummy()) {
             if ($item->getHasChildren()) {
                 foreach ($item->getChildrenItems() as $child) {
-                    if (empty($qtys) || (count(array_unique($qtys)) === 1 && end($qtys) == 0)) {
+                    if (empty($qtys) || (count(array_unique($qtys)) === 1 && (int)end($qtys) === 0)) {
                         if ($this->canRefundNoDummyItem($child, $invoiceQtysRefundLimits)) {
                             return true;
                         }