Change hook_form_alter to hook_form_FORM_ID_alter

It would be better if we change hook_form_alter() to hook_form_FORM_ID_alter(). This prevent the alter hook being invoked when not required.

/**
 * Implements hook_form_alter().
 *
 * Checks for the user password reset form and changes the validate and submit
 * functions. Uses the overrided functions defined in this module instead of
 * Drupal cores.
 */
function username_enumeration_prevention_form_alter(&$form, &$form_state, $form_id) {
  // Check to see if form is the reset password form.
  if (strlen(strstr($form_id, 'user_pass')) > 0) {
    // Override core validate and submit actions.
    $form['#validate'][array_search('user_pass_validate', $form['#validate'])] = 'username_enumeration_prevention_pass_validate';
    $form['#submit'][array_search('user_pass_submit', $form['#submit'])] = 'username_enumeration_prevention_pass_submit';
  }
}

to

/**
 * Implements hook_form_alter().
 *
 * Checks for the user password reset form and changes the validate and submit
 * functions. Uses the overrided functions defined in this module instead of
 * Drupal cores.
 */
function username_enumeration_prevention_form_alter(&$form, &$form_state, $form_id) {
  // Override core validate and submit actions.
  $form['#validate'][array_search('user_pass_validate', $form['#validate'])] = 'username_enumeration_prevention_pass_validate';
  $form['#submit'][array_search('user_pass_submit', $form['#submit'])] = 'username_enumeration_prevention_pass_submit';
}