netdevice: add the case if dev is NULL

stable inclusion
from stable-v4.19.238
commit 574a12b4445076a04499962ce8b8ae15f75a7955
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I51YBN


CVE: CVE-2022-28356

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

commit b37a466837393af72fe8bcb8f1436410f3f173f3 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>
Reviewed-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>