netfilter: nft_set_pipapo: no need to call pipapo_deactivate() from flush

Use the element object that is already offered instead.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nft_set_pipapo.c

@@ -1814,8 +1814,9 @@ static bool nft_pipapo_flush(const struct net *net, const struct nft_set *set,
 {
 	struct nft_pipapo_elem *e = elem;
 
-	return pipapo_deactivate(net, set, (const u8 *)nft_set_ext_key(&e->ext),
-				 &e->ext);
+	nft_set_elem_change_active(net, set, &e->ext);
+
+	return true;
 }
 
 /**