Description:
------------
When executing scripts, they work but the script ends with a "Segmentation fault".
This happens with php-7.1.6 as well as php-7.0.20, both using the ssh2-1.1.1.tgz release from pecl.php.net.
This does not happen when using php-5.6 with ssh2-0.13.tgz.

Test script:
---------------
<?php
$cfg_host = '';
$cfg_user = '';
$cfg_passwd = '';
$remote_folder = '';

$ssh_session = ssh2_connect($cfg_host);
if($ssh_session === FALSE) {
  exit(1);
}
elseif(!ssh2_auth_password($ssh_session, $cfg_user, $cfg_passwd)) {
  exit(1);
}
else {
  // ok
}

$sftp = ssh2_sftp($ssh_session);

if(ssh2_sftp_stat($sftp, $remote_folder) === FALSE) {
  // creating the folder is not in the scope of this script
  exit(0);
}

$remote_path = sprintf('ssh2.sftp://%s/%s', $sftp, ltrim($remote_folder, '/'));
$folder = opendir($remote_path);

return; // segmentation fault

Expected result:
----------------
not a segfault

Actual result:
--------------
"Segmentation fault" is written to STDERR when the script ends. You can do a bunch of work after calling opendir() without any problems, though.