Description:
------------
Follow on from http://pecl.php.net/bugs/bug.php?id=3391

Using php5.0-win32-200502090930 
with stable versions of
 php_pdo.dll             09-Feb-2005 10:39    52k 
 php_pdo_sqlite.dll      09-Feb-2005 10:39   216k  

breaks Null handling more, now get an access violation at any attempt to execute a statement that has NULL value.

Reproduce code:
---------------
<?php
	$pdo = new PDO('sqlite::memory:');
	$pdo->exec('CREATE TABLE test(ID INT NOT NULL PRIMARY KEY, Field
VARCHAR(12) NULL);');
	$stmt = $pdo->prepare('INSERT INTO test(ID, Field) VALUES(?, ?)');

	$one = 1;
	$two = 2;
	$null = NULL;
// Try with PDO_PARAM_NULL
	$stmt->bindParam(1, $one, PDO_PARAM_INT);
	$stmt->bindParam(2, $null, PDO_PARAM_STR);
	assert($stmt->execute());

?>


Expected result:
----------------
A row inserted.

Actual result:
--------------
PHP has encountered an Access Violation at 017ED696