netrom: fix copying in user data in nr_setsockopt

stable inclusion
from stable-v5.10.91
commit a7c2cae997db6d39a858f42d898d866058a7e035
bugzilla: 186187 https://gitee.com/openeuler/kernel/issues/I4SI2C

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a7c2cae997db6d39a858f42d898d866058a7e035



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

commit 3087a6f3 upstream.

This code used to copy in an unsigned long worth of data before
the sockptr_t conversion, so restore that.

Fixes: a7b75c5a ("net: pass a sockptr_t into ->setsockopt")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
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>