Description:
------------
When imap_sort() is called with valid arguments, it leaks the
sortpgm memory.


Test script:
---------------
<?php
$stream = imap_open($mailbox, $username, $password);
imap_sort($stream, SORTFROM, 0);
?>


Expected result:
----------------
no leaks


Actual result:
--------------
Detected memory leaks!
Dumping objects ->
{45271} normal block at 0x000001F1F8ED9C80, 40 bytes long.
 Data: <                > 00 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00 
Object dump complete.