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

* commit '86f939e832c257b5fa2606aed00e9dfaeaef90cd':
  Include code when converting unknown causes to string
diff --git a/telephony/java/android/telephony/DisconnectCause.java b/telephony/java/android/telephony/DisconnectCause.java
index 3fb6be7..6fe10dc 100644
--- a/telephony/java/android/telephony/DisconnectCause.java
+++ b/telephony/java/android/telephony/DisconnectCause.java
@@ -263,7 +263,7 @@
         case OUTGOING_CANCELED:
             return "OUTGOING_CANCELED";
         default:
-            return "INVALID";
+            return "INVALID: " + cause;
         }
     }
 }