code cleanup

app/src/main/java/info/nightscout/android/medtronic/MainActivity.java

@@ -123,8 +123,8 @@ public class MainActivity extends AppCompatActivity implements OnSharedPreferenc
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
             final String packageName = getPackageName();
-            //Log.d(TAG, "Maybe ignoring battery optimization");
             final PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
+
             if (!pm.isIgnoringBatteryOptimizations(packageName)) {
                 Log.d(TAG, "Requesting ignore battery optimization");
                 try {

app/src/main/java/info/nightscout/android/medtronic/service/MedtronicCnlAlarmReceiver.java

@@ -66,9 +66,12 @@ public class MedtronicCnlAlarmReceiver extends WakefulBroadcastReceiver {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
             alarmManager.setAlarmClock(new AlarmManager.AlarmClockInfo(millis, null), pendingIntent);
         } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
+            // Android 5.0.0 + 5.0.1 (e.g. Galaxy S4) has a bug.
+            // Alarms are not exact. Fixed in 5.0.2 oder CM12
             alarmManager.setExact(AlarmManager.RTC_WAKEUP, millis, pendingIntent);
-        } else
+        } else {
             alarmManager.set(AlarmManager.RTC_WAKEUP, millis, pendingIntent);
+        }
     }
 
     // restarting the alarm after MedtronicCnlIntentService.POLL_PERIOD_MS from now