netfilter: ipset: remove useless memset() calls

One of the memset call is buggy: it does not erase full array, but only pointer size.
Moreover, after a check, first step of nla_parse_nested/nla_parse is to
erase tb array as well. We can remove both calls safely.
Signed-off-by: Florent Fourcot <florent.fourcot@wifirst.fr>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>

net/netfilter/ipset/ip_set_core.c

@@ -1599,7 +1599,6 @@ static int ip_set_uadd(struct net *net, struct sock *ctnl, struct sk_buff *skb,
 		int nla_rem;
 
 		nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) {
-			memset(tb, 0, sizeof(tb));
 			if (nla_type(nla) != IPSET_ATTR_DATA ||
 			    !flag_nested(nla) ||
 			    nla_parse_nested_deprecated(tb, IPSET_ATTR_ADT_MAX, nla, set->type->adt_policy, NULL))
@@ -1651,7 +1650,6 @@ static int ip_set_udel(struct net *net, struct sock *ctnl, struct sk_buff *skb,
 		int nla_rem;
 
 		nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) {
-			memset(tb, 0, sizeof(*tb));
 			if (nla_type(nla) != IPSET_ATTR_DATA ||
 			    !flag_nested(nla) ||
 			    nla_parse_nested_deprecated(tb, IPSET_ATTR_ADT_MAX, nla, set->type->adt_policy, NULL))