PHP7 Notice: Only variables should be passed by reference

Hello,

To avoid the notice: "Notice : Only variables should be passed by reference",
I had to change the file "i18n_commerce_product.module" on ligne 221 like this:

form :

drupal_alter('commerce_cart_product_comparison_properties', $comparison_properties, clone($line_item));

to :

$line_item_clone = clone($line_item);
    drupal_alter('commerce_cart_product_comparison_properties', $comparison_properties, $line_item_clone);