Description:
------------
Reports Warning: imagepstext(): AA steps must be 4 or 16 even if 4 or 16 is specified

Test script:
---------------
$font_file = "font.pfm";
$im = imagecreatetruecolor(200, 200);
$black = imagecolorallocate($im, 0, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);
$font = imagepsloadfont( $font_file );
$coords = imagepstext($im, 'Sample text is simple', $font, 12, $black, $white, 50, 50, 0, 0, 0.0, 4);
print_r( $coords );

Expected result:
----------------
should return a array of 4 values

Actual result:
--------------
returns NULL and always generates Warning: imagepstext(): AA steps must be 4 or 16 even if AA steps parameter is defaulted or explicit 4 or 16

works correctly on 5.3.3 and 5.2.16