From 7175fe90153e6375082d65884fbb41ab3bbb4901 Mon Sep 17 00:00:00 2001
From: Yanchuan Nian <ycnian@gmail.com>
Date: Wed, 31 Oct 2012 16:05:48 +0800
Subject: [PATCH] nfs: Check whether a layout pointer is NULL before free it

The new layout pointer in pnfs_find_alloc_layout() may be NULL because of
out of memory. we must do some check work, otherwise pnfs_free_layout_hdr()
will go wrong because it can not deal with a NULL pointer.

Signed-off-by: Yanchuan Nian <ycnian@gmail.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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