Incorrect SQL syntax in Export.php WHERE clause causes Export to hang

In CRM/Export/BAO/Export.php, there is a set of lines creating a WHERE clause that don't have parenthesis in the right place. So the query runs an OR clause, causing all records from civicrm_group_contact to be queried for every contact returned. If civicrm_group_contact has many rows, it will hang the query for a while.

Here are the two lines in question (only the 2nd line needs changing). In 3.4.4 and 4.0.4, this is line 455 and 456. In 3.2.5, it's 414/415:
$oldClause = "contact_a.id = civicrm_group_contact.contact_id";
$newClause = " ( $oldClause AND civicrm_group_contact.status = 'Added' OR civicrm_group_contact.status IS NULL ) ";

The second line should be something like this instead:
$newClause = " ( $oldClause AND (civicrm_group_contact.status = 'Added' OR civicrm_group_contact.status IS NULL) ) ";
--with the parens around the two status clauses

Sorry, I wasn't sure if a patch file was needed due to it being a one-line change (and not sure which version to work off since we're on an old version still).