Issue #2706579: Remove now-unneeded extra validation

  if ($form_id == 'dblog_admin_settings') {

    $form['dblog_row_limit']['#options'] = drupal_map_assoc(array(100, 1000, 10000, 100000, 250000, 500000, 1000000));

  }

  // Ensure that duplicate case-insensitive usernames are not created.

  if ($form_id == 'user_profile_form' || $form_id == 'user_register_form') {

    $form['#validate'][] = 'drupalorg_username_validate';

  }

}

/**

  }

}

/**

 * Perform a case-insensitive check on usernames to prevent duplicates.

 *

 * @see user_account_form()

 * @see user_account_form_validate()

 * @see http://drupal.org/node/1034852

 */

function drupalorg_username_validate($form, &$form_state) {

  // Do not attempt to validate secondary profile forms

  if (!isset($form_state['values']['name'])) {

    return;

  }

  $account = $form['#user'];

  $name = $form_state['values']['name'];

  $existing_name = $account->uid > 0 ? $account->name : FALSE;

  // Only check if there isn't an existing error, to prevent confusion.

  if (!empty($name) && ($existing_name !== $name) && !form_get_error($form['account']['name'])) {

    // Check for duplicate usernames. This is taken from

    // user_account_form_validate(), but converts names to lowercase first.

    if ((bool) db_select('users')->fields('users', array('uid'))->condition('uid', $account->uid, '<>')->where('LOWER(name) LIKE :name', array(':name' => db_like(strtolower($name))))->range(0, 1)->execute()->fetchField()) {

      form_set_error('name', t('The name %name is already taken.', array('%name' => $name)));

    }

  }

}

/**

 * Implements hook_form_FORM_ID_alter() for Guide node form.

 */