Fix AppOsManager missing mutex unlock.

Need unlock the mutex after finish the getToken operation.

Change-Id: Icd83b383913d06e4d60976857aa314c3008ebea1
diff --git a/libs/binder/AppOpsManager.cpp b/libs/binder/AppOpsManager.cpp
index 99c2747..61b4f7d 100644
--- a/libs/binder/AppOpsManager.cpp
+++ b/libs/binder/AppOpsManager.cpp
@@ -31,6 +31,7 @@
     if (gToken == NULL) {
         gToken = service->getToken(new BBinder());
     }
+    pthread_mutex_unlock(&gTokenMutex);
     return gToken;
 }