Fix vulnerability in handling _session argument of utils/save-prefs (#1489382)

Aleksander Machniak

2013-10-17 197203727417a03d87053a47e5aa5175a76e3e0b

 program/include/rcube_session.php

@@ -319,7 +319,8 @@
   */
  public function mc_destroy($key)
  {
    $ret = $this->memcache->delete($key);
    // #1488592: use 2nd argument
    $ret = $this->memcache->delete($key, 0);
    if ($this->mc_debug) write_log('memcache', "delete($key): " . ($ret ? 'OK' : 'ERR'));
    return $ret;
  }