From d7631250b20119ea763d9ba461c3a9c5710cfa98 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Mon, 26 Aug 2013 17:26:51 -0400
Subject: [PATCH] NFSv4: Fix a potentially Oopsable condition in
 __nfs_idmap_unregister

Ensure that __nfs_idmap_unregister can be called twice without
consequences.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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