#50 db_mssql.inc and metadata() another bug

[Jarosław Zabiełło]

If you are using MS-SQL7, you should delete from
function metadata() the following line:

$this->free_result();

Without this, you can get sth like that:

Warning: Supplied argument is not a valid MS SQL-
result resource in I:\phplib\db_mssql.inc on line 46