[ Upstream commit 3dac3583 ]

It is not safe to dereference an object before a null test. It is
not needed and just remove them. Ftrace can be used instead.
Signed-off-by: Nzhong jiang <zhongjiang@huawei.com>
Acked-by: NAndrew Donnellan <andrew.donnellan@au1.ibm.com>
Acked-by: NFrederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>