Fix coding guideline issues.

db/events.php

@@ -23,6 +23,8 @@
  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+defined('MOODLE_INTERNAL') || die();
+
 // List of observers.
 $observers = array(
 

lib.php

@@ -275,7 +275,7 @@ function attendance_grade_item_update($attendance, $grades=null) {
         $params = array('itemname' => $attendance->name, 'idnumber' => $attendance->cmidnumber);
     } else {
         // MDL-14303.
-        $params = array('itemname' => $attendance->name/*, 'idnumber'=>$attendance->id*/);
+        $params = array('itemname' => $attendance->name);
     }
 
     if ($attendance->grade > 0) {

renderhelpers.php

@@ -218,7 +218,7 @@ class user_sessions_cells_text_generator extends user_sessions_cells_generator {
     }
 }
 
-// Used to print simple time - 1am instead of 1:00am
+// Used to print simple time - 1am instead of 1:00am.
 function attendance_strftimehm($time) {
     $mins = userdate($time, '%M');
     if ($mins == '00') {