🚑 fix(core) Fixed error in password method locking

issue #5970

include/password-methods/class_password-methods.inc

@@ -181,6 +181,8 @@ class passwordMethod
       }
     }
     $modify['userPassword'] = $pwd;
+
+    $ldap = $config->get_ldap_link();
     $ldap->cd($dn);
     $ldap->modify($modify);