netfilter: nft_compat: use nfnetlink_unicast()

mainline inclusion
from mainline-v5.15-rc1
commit 241d1af4
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I58CKN
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=241d1af4c11a75d4c17ecc0193a6ab60553efbfc



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

Use nfnetlink_unicast() which already translates EAGAIN to ENOBUFS,
since EAGAIN is reserved to report missing module dependencies to the
nfnetlink core.

e0241ae6 ("netfilter: use nfnetlink_unicast() forgot to update
this spot.

Reported-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Xu Jia <xujia39@huawei.com>
Reviewed-by: Yue Haibing <yuehaibing@huawei.com>
Reviewed-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>