Description:
------------
Using stream_socket_client on it's own works fine, but once using stream_context_create with it it creates a memory leak of 2kb each time which makes it unstable.

Test script:
---------------
<?php
  for ($i =0 ; $i <30 ; $i++)
  {
    $socket_options = array('socket' => array('bindto' => '127.0.0.1:0'));
    $socket_context = stream_context_create($socket_options);

    $fp=stream_socket_client('tcp://127.0.0.1:23', $error, $err, 5, STREAM_CLIENT_ASYNC_CONNECT|STREAM_CLIENT_CONNECT, $socket_context);

    unset($socket_context);
    unset($socket_options);
    unset ($fp);
    unset ($error);
    unset ($err);clea
    
    echo memory_get_usage()."\n";
  }
?>

Expected result:
----------------
648504
650400
650400
654000
650400
650400
650400
650400
650400
650400
650400
650400
650400
650400
650400
650400
650400
....

Actual result:
--------------
648504
650400
652200
654000
655864
657664
659464
661264
663064
664864
666664
668464
670392
672192
673992
675792
677592
679392
681192
682992
684792
686592
688392
690192
691992
693792
695592
697392
699448
701248