netfilter: ipset: Check IPSET_ATTR_PORT only once
We do not need to check tb[IPSET_ATTR_PORT] != NULL before retrieving port, as this attribute is known to exist due to ip_set_attr_netorder() returning true only when attribute exists and it is in network byte order. Signed-off-by: NSergey Popovich <popovich_sergei@mail.ua> Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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