From 0c7bf3e8cab7900e17ce7f97104c39927d835469 Mon Sep 17 00:00:00 2001
From: Zefan Li <lizefan@huawei.com>
Date: Sat, 20 Sep 2014 14:49:10 +0800
Subject: [PATCH] cgroup: remove redundant variable in cgroup_mount()

Both pinned_sb and new_sb indicate if a new superblock is needed,
so we can just remove new_sb.

Note now we must check if kernfs_tryget_sb() returns NULL, because
when it returns NULL, kernfs_mount() may still re-use an existing
superblock, which is just allocated by another concurent mount.

Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Zefan Li <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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