MTP: add strict bounds checking for all incoming packets

Previously we did not sanity check incoming MTP packets,
which could result in crashes due to reading off the edge of a packet.
Now all MTP packet getter functions return a boolean result
(true for OK, false for reading off the edge of the packet)
and we now return errors for malformed packets.

Bug: 18113092
Change-Id: Ic7623ee96f00652bdfb4f66acb16a93db5a1c105
diff --git a/media/mtp/MtpObjectInfo.h b/media/mtp/MtpObjectInfo.h
index c7a449c..86780f1 100644
--- a/media/mtp/MtpObjectInfo.h
+++ b/media/mtp/MtpObjectInfo.h
@@ -50,7 +50,7 @@
                         MtpObjectInfo(MtpObjectHandle handle);
     virtual             ~MtpObjectInfo();
 
-    void                read(MtpDataPacket& packet);
+    bool                read(MtpDataPacket& packet);
 
     void                print();
 };