netfilter: nf_tables: Drop pointless memset when dumping rules

None of the dump callbacks uses netlink_callback::args beyond the first
element, no need to zero the data.

Fixes: 96518518 ("netfilter: add nftables")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>

net/netfilter/nf_tables_api.c

@@ -3465,10 +3465,6 @@ static int __nf_tables_dump_rules(struct sk_buff *skb,
 			goto cont_skip;
 		if (*idx < s_idx)
 			goto cont;
-		if (*idx > s_idx) {
-			memset(&cb->args[1], 0,
-					sizeof(cb->args) - sizeof(cb->args[0]));
-		}
 		if (prule)
 			handle = prule->handle;
 		else