From: Li Zefan <lizefan@huawei.com>
Date: Thu, 1 Aug 2013 01:51:47 +0000 (+0800)
Subject: cgroup: restructure the failure path in cgroup_write_event_control()
X-Git-Tag: v3.12-rc1~173^2~51
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=876ede8b2b9880615be0de3ec7b8afd0a1786e76;p=pandora-kernel.git

cgroup: restructure the failure path in cgroup_write_event_control()

It uses a single label and checks the validity of each pointer. This
is err-prone, and actually we had a bug because one of the check was
insufficient.

Use multi lables as we do in other places.

v2:
- drop initializations of local variables.

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