[ Upstream commit 22233f7b ]

This patch fixes the following checkpatch warning:

| Macro argument 'x' may be better as '(x)' to avoid precedence issues

Fixes: cbffaf7a ("can: flexcan: Always use last mailbox for TX")
Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>