Fix NPE in FlashlightController

Bug: 18007548
Change-Id: Iecd1303feeb8062741752862312043ecd75cebbe

packages/SystemUI/src/com/android/systemui/statusbar/policy/FlashlightController.java

diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/policy/FlashlightController.java b/packages/SystemUI/src/com/android/systemui/statusbar/policy/FlashlightController.java
index 6f021ac..33f7aff 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/policy/FlashlightController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/policy/FlashlightController.java
@@ -308,7 +308,11 @@
             new CameraCaptureSession.StateListener() {
         @Override
         public void onConfigured(CameraCaptureSession session) {
-            mSession = session;
+            if (session.getDevice() == mCameraDevice) {
+                mSession = session;
+            } else {
+                session.close();
+            }
             postUpdateFlashlight();
         }