IPV6 tethering: Check info for null before removeUpstreamV6Interface

When tethering on dual stack networks such as verizon wireless and
sending or recieving MMS you get an null pointer exception and hard
reboot.

It starts to go wrong here:
10-14 19:11:51.375: E/Mms/smil(28035): Failed to parse SMIL document.
10-14 19:11:51.375: E/Mms/smil(28035): org.xml.sax.SAXParseException:
expected start tag notEND_DOCUMENT null@1:1 in java.io.InputStreamReader
@4192ada0

And then:
10-14 19:11:55.559: E/AndroidRuntime(23125): java.lang.NullPointerException
10-14 19:11:55.559: E/AndroidRuntime(23125):    at com.android.server.
connectivity.Tethering$TetherMasterSM$TetherModeAliveState.processMessage
(Tethering.java:1573)

Which is line 1573 of:

https://github.com/CyanogenMod/android_frameworks_base/blob/cm-10.2/services/java/com/android/server/connectivity/Tethering.java#L1573

CMD_UPSTREAM_CHANGED's message.obj can be null (line 776).

Change-Id: I13d531d398f2e33a828c6e81f25f4b2a27518d34
Camera: Video HDR Feature Integration.

Added framework support for camera applications to query supported
video HDR modes and set the required mode.

Change-Id: Ie318e586838a2f035e59e30fa51af35b52f7c886
Camera: Adds support for meta data callbacks

- This change adds a new type of callback
  that will be called when there are pending
  meta data notifications.

Change-Id: I84f5cbafe4f023c7b0efa9ec8620756b0eaa428d
Frameworks: Enhance face detection

Add support for facial processing features:
smile detection, gaze detection and blink detection

Change-Id: Ic186ff0658e755a8b5287cffa1dd58d9eafebc9a
Frameworks: QCFace framework added

Add framework support for extended face detect

Change-Id: I2a1c477ee6d11f2b9764966abbb85ede9100fe91
Camera: Adds support for longshot configuration

- The Camera API is extended with one additional
  call for longshot mode configuration.

Change-Id: If3bcad003facae22ec2bd690480dc3db63f0b28a
merge changes from CyanogenMod 10.2 into local branch