Fix build

Change-Id: Ie056247ee9c4ae7693f3f5f5f68d4322546ee61a

core/jni/android_util_Binder.cpp

@@ -200,7 +200,6 @@ static void report_exception(JNIEnv* env, jthrowable excep, const char* msg)
          * that can be made while an exception is pending, so we want to
          * get the VM ptr, throw the exception, and then detach the thread.
          */
-        JavaVM* vm = jnienv_to_javavm(env);
         env->Throw(excep);
         env->ExceptionDescribe();
         ALOGE("Forcefully exiting");