can: sun4i_can: do not report txerr and rxerr during bus-off

stable inclusion
from stable-v5.10.137
commit cddef4bbebea18bcbfde1bbe7ea13ddb5c947aad
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I60PLB

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=cddef4bbebea18bcbfde1bbe7ea13ddb5c947aad

--------------------------------

[ Upstream commit 0ac15a8f ]

During bus off, the error count is greater than 255 and can not fit in
a u8.

Fixes: 0738eff1 ("can: Allwinner A10/A20 CAN Controller support - Kernel module")
Link: https://lore.kernel.org/all/20220719143550.3681-7-mailhol.vincent@wanadoo.fr


CC: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>