MC-42288: Coupon codes for existing cart price rule are not generated

- Use strict comparison

Author: loganadhan-palanisamy

app/code/Magento/SalesRule/Controller/Adminhtml/Promo/Quote/Generate.php

@@ -80,7 +80,7 @@ public function execute()
 
         if (!$rule->getId()) {
             $result['error'] = __('Rule is not defined');
-        } elseif ($rule->getCouponType() != \Magento\SalesRule\Model\Rule::COUPON_TYPE_AUTO
+        } elseif ((int) $rule->getCouponType() !== \Magento\SalesRule\Model\Rule::COUPON_TYPE_AUTO
             && !$rule->getUseAutoGeneration()) {
             $result['error'] =
                 __('Rule is not saved with auto generate option enabled. Please save the rule and try again.');