Fix qodana warning - missing return

htdocs/product/class/product.class.php

@@ -5462,6 +5462,8 @@ class Product extends CommonObject
 				return -1;
 			}
 		}
+
+		return -1;
 	}
 
 	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps