Check that InputDevice isn't null and add annotations

The API 'getDevice' can return null. Let's make sure null isn't
dereferenced. Also, add nullability annotations to make it easier to
follow.

Bug: 227733127
Test: build only
Change-Id: Ice514f27d4347528d009969174f09078dfa2afac

core/java/android/hardware/input/InputDeviceSensorManager.java

@@ -98,7 +98,7 @@ public class InputDeviceSensorManager implements InputManager.InputDeviceListene
      */
     private void updateInputDeviceSensorInfoLocked(int deviceId) {
         final InputDevice inputDevice = InputDevice.getDevice(deviceId);
-        if (inputDevice.hasSensor()) {
+        if (inputDevice != null && inputDevice.hasSensor()) {
             final InputSensorInfo[] sensorInfos =
                     mInputManager.getSensorList(deviceId);
             populateSensorsForInputDeviceLocked(deviceId, sensorInfos);