Description:
------------
fgetcsv returns null if passed false as the handle. This should cause and error instead of a warning and cause the function to return false.

Reproduce code:
---------------
<?php

$handle = fopen("foo","r");

var_dump($data = fgetcsv($handle,0,",",'"'));

while (($data = fgetcsv($handle,0,",",'"')) !== false) {
	echo 'test';
}

?>

Expected result:
----------------
Warning: fopen(foo): failed to open stream: No such file or directory in /home/sbarre85/test.php on line 3

Warning: fgetcsv() expects parameter 1 to be resource, boolean given in /home/sbarre85/test.php on line 5
bool(false)

Error: fgetcsv() expects parameter 1 to be resource, boolean given in /home/sbarre85/test.php on line 7

Actual result:
--------------
Warning: fopen(foo): failed to open stream: No such file or directory in /home/sbarre85/test.php on line 3

Warning: fgetcsv() expects parameter 1 to be resource, boolean given in /home/sbarre85/test.php on line 5
NULL

Warning: fgetcsv() expects parameter 1 to be resource, boolean given in /home/sbarre85/test.php on line 7
test

.. looping infinitly