mmc: renesas_sdhi: initialize variable properly when tuning

stable inclusion
from stable-v5.10.85
commit 172a982244182180dc1823c96c449b93996d6d36
bugzilla: 186032 https://gitee.com/openeuler/kernel/issues/I4QVI4

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=172a982244182180dc1823c96c449b93996d6d36



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

commit 7dba4028 upstream.

'cmd_error' is not necessarily initialized on some error paths in
mmc_send_tuning(). Initialize it.

Fixes: 2c9017d0 ("mmc: renesas_sdhi: abort tuning when timeout detected")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20211130132309.18246-1-wsa+renesas@sang-engineering.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>