Fix SQL error on logout when using session_storage=php (#1490421)

Aleksander Machniak

2015-06-05 d438147ddc057e27e45954ca9f3ccb47d6292a34

 program/lib/Roundcube/rcube_session.php

@@ -144,7 +144,15 @@
     */
    public function destroy($key)
    {
        return $this->memcache ? $this->mc_destroy($key) : $this->db_destroy($key);
        if ($this->storage == 'memcache' && $this->memcache) {
            return $this->mc_destroy($key);
        }
        else if ($this->storage == 'db') {
            return $this->db_destroy($key);
        }
        else {
            return true;
        }
    }