Fix NPE when toggling flashlight from power control widget

D/AndroidRuntime( 4071): Shutting down VM
W/dalvikvm( 4071): threadid=1: thread exiting with uncaught exception (group=0x40018560)
E/AndroidRuntime( 4071): FATAL EXCEPTION: main
E/AndroidRuntime( 4071): java.lang.RuntimeException: Unable to start receiver com.android.settings.widget.SettingsAppWidgetProvider: java.lang.NullPointerException
E/AndroidRuntime( 4071): 	at android.app.ActivityThread.handleReceiver(ActivityThread.java:1926)
E/AndroidRuntime( 4071): 	at android.app.ActivityThread.access$2400(ActivityThread.java:123)
E/AndroidRuntime( 4071): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:989)
E/AndroidRuntime( 4071): 	at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 4071): 	at android.os.Looper.loop(Looper.java:130)
E/AndroidRuntime( 4071): 	at android.app.ActivityThread.main(ActivityThread.java:3835)
E/AndroidRuntime( 4071): 	at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 4071): 	at java.lang.reflect.Method.invoke(Method.java:507)
E/AndroidRuntime( 4071): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864)
E/AndroidRuntime( 4071): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
E/AndroidRuntime( 4071): 	at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 4071): Caused by: java.lang.NullPointerException
E/AndroidRuntime( 4071): 	at com.android.settings.widget.buttons.FlashlightButton.toggleState(FlashlightButton.java:36)
E/AndroidRuntime( 4071): 	at com.android.settings.widget.SettingsAppWidgetProvider.onReceive(SettingsAppWidgetProvider.java:363)
E/AndroidRuntime( 4071): 	at android.app.ActivityThread.handleReceiver(ActivityThread.java:1915)
E/AndroidRuntime( 4071): 	... 10 more

Change-Id: I1b5f94e0c15c330b02d0a99fa7d6cb70e97665e0