netdevice: add the case if dev is NULL

stable inclusion
from stable-v5.10.110
commit ff919a7ad90c361634f0bc5c58120252d87b887a
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I51YBN
CVE: CVE-2022-28356

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?ff919a7ad90c361634f0bc5c58120252d87b887a



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

commit b37a4668 upstream.

Add the case if dev is NULL in dev_{put, hold}, so the caller doesn't
need to care whether dev is NULL or not.

Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Pavel Machek <pavel@denx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Huang Guobin <huangguobin4@huawei.com>
Reviewed-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>