Description:
------------
Using pingImageFile produces unexpected results.

My specs:
	ImageMagick version: ImageMagick 6.3.7 01/11/08 Q16
	PHP version: 5.25
	Windows version: XP 32 bit
	Apache version: 2.2.6
	Imagick version: 2.1.0RC3 

Reproduce code:
---------------
<?php
error_reporting(E_ALL);
//$file = 'http://www.imagemagick.org/image/script.png';
$file = 'mast.jpg';
$im = new Imagick();
if(($fh = fopen($file,'r')) === FALSE){
    die('Failed to open file for reading!');
}
$im->pingImageFile($fh);
var_dump($im->getImageGeometry());
?>

Expected result:
----------------
The output of getImageGeometry

Actual result:
--------------
tested with jpg,gif,png -

Local File (same directory as the script) :
	cli - crashes cli
        apache - crashes apache, error log entry: Parent: child process exited with status 3221225477 -- Restarting

Remote File:
	cli & apache -
	PHP Fatal error:  Uncaught exception 'ImagickException' with message 'Can not process empty wand' in C:\\dev\\RT-gallerymgr\\public_html\\magick.php:10\nStack trace:\n#0 C:\\dev\\RT-gallerymgr\\public_html\\magick.php(10): Imagick->getimagegeometry()\n#1 {main}\n  thrown in C:\\dev\\RT-gallerymgr\\public_html\\magick.php on line 10