discuz 删除主题贴，禁止积分退回。

文件：
source\function\function_core.php
找到

function batchupdatecredit($action, $uids = 0, $extrasql = array(), $coef = 1, $fid = 0) {

	$credit = & credit::instance();
	if($extrasql) {
		$credit->extrasql = $extrasql;
	}
        return $credit->updatecreditbyrule($action, $uids, $coef, $fid);
 }

修改为：

function batchupdatecredit($action, $uids = 0, $extrasql = array(), $coef = 1, $fid = 0) {
    if (!in_array($fid,array("42"))) {

	$credit = & credit::instance();
	if($extrasql) {
		$credit->extrasql = $extrasql;
	}
        return $credit->updatecreditbyrule($action, $uids, $coef, $fid);
    }
}