Description:
------------
When the mysqlnd driver is used PDOStatement->nextRowset() does not return bool(false) when there are no more result sets. This causes several test 
failures, which all have a diff looking similar to this:

    008+
    009+ Warning: PDOStatement::fetchAll(): SQLSTATE[HY000]: General error in %s/bug_41997.php on line 11
    010+ array(0) {
    011+ }

This can be traced down to mysql_next_result() returning 0 instead of -1 in http://lxr.php.net/xref/PHP_TRUNK/ext/pdo_mysql/mysql_statement.c#415.

The reason is that (when using mysqlnd) mysql_next_result is aliased to mysqlnd_next_result, but both have different APIs: The mysqlnd_ version only returns PASS = 0 or FAIL = 1, whereas the mysql_ version returns -1 if the call worked, but there were no more resultsets.

This is documented at http://dev.mysql.com/doc/refman/5.0/en/mysql-next-result.html in the "Return Values" section. The default mysqlnd next_result implementation is here: http://lxr.php.net/xref/PHP_TRUNK/ext/mysqlnd/mysqlnd.c#2100.