Flexicharge duplicate entries

Hi,

after adding a coupon code to the review page, all flexicharges show twice,

i made a little dirty fix:

add in function "flexicharge_checkoutapi"

before "while ($charge = db_fetch_object($configured_charges)) {"

      if(is_array($txn->misc)) {
        $i = 0;
        foreach ($txn->misc as $misc) {
          if ($misc->callback == 'general_sitewide_flexicharge_calculate') {
            unset($txn->misc[$i]);
          }
          $i++;
        }
      }

or see the attached file.

this is for all version of this contrib.

please review.

regards pebosi