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Replace netlink_unicast() calls by nfnetlink_unicast() which already deals with translating EAGAIN to ENOBUFS as the nfnetlink core expects. nfnetlink_unicast() calls nlmsg_unicast() which returns zero in case of success, otherwise the netlink core function netlink_rcv_skb() turns err > 0 into an acknowlegment. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>