Add current state to unhandled message error log

Note that I am not certain whether (nullable) mCurrentState can be null
in the given context, though checking for it seems safest.

Test: TH
Change-Id: I8f6f3e060efab775a4ecc9fe92333aa62dbde5ec
diff --git a/staticlibs/device/com/android/net/module/util/SyncStateMachine.java b/staticlibs/device/com/android/net/module/util/SyncStateMachine.java
index da184d3..fc0161b 100644
--- a/staticlibs/device/com/android/net/module/util/SyncStateMachine.java
+++ b/staticlibs/device/com/android/net/module/util/SyncStateMachine.java
@@ -225,7 +225,8 @@
             consideredState = mStateInfo.get(consideredState.parent);
         }
         if (null == consideredState) {
-            Log.wtf(mName, "Message " + msg.what + " was not handled");
+            final String state = mCurrentState == null ? "null" : mCurrentState.getName();
+            Log.wtf(mName, "Message " + msg.what + " was not handled. Current state: " + state);
         }
 
         performTransitions();