am 86f939e8: Merge "Include code when converting unknown causes to string" into lmp-dev

* commit '86f939e832c257b5fa2606aed00e9dfaeaef90cd':
  Include code when converting unknown causes to string

telephony/java/android/telephony/DisconnectCause.java

@@ -263,7 +263,7 @@ public class DisconnectCause {
         case OUTGOING_CANCELED:
             return "OUTGOING_CANCELED";
         default:
-            return "INVALID";
+            return "INVALID: " + cause;
         }
     }
 }