mISDN: fix possible memory leak in mISDN_register_device()

stable inclusion
from stable-v5.10.154
commit e77d213843e67b4373285712699b692f9c743f61
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I64YCB

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e77d213843e67b4373285712699b692f9c743f61



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

[ Upstream commit e7d1d4d9 ]

Afer commit 1fa5ae85 ("driver core: get rid of struct device's
bus_id string array"), the name of device is allocated dynamically,
add put_device() to give up the reference, so that the name can be
freed in kobject_cleanup() when the refcount is 0.

Set device class before put_device() to avoid null release() function
WARN message in device_release().

Fixes: 1fa5ae85 ("driver core: get rid of struct device's bus_id string array")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Lipeng Sang <sanglipeng1@jd.com>