netfilter: nft_set_pipapo: release elements in clone only from destroy path

Clone already always provides a current view of the lookup table, use it
to destroy the set, otherwise it is possible to destroy elements twice.

This fix requires:

 212ed75d ("netfilter: nf_tables: integrate pipapo into commit protocol")

which came after:

 9827a0e6 ("netfilter: nft_set_pipapo: release elements in clone from abort path").

Fixes: 9827a0e6 ("netfilter: nft_set_pipapo: release elements in clone from abort path")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nft_set_pipapo.c

@@ -2329,8 +2329,6 @@ static void nft_pipapo_destroy(const struct nft_ctx *ctx,
 	if (m) {
 		rcu_barrier();
 
-		nft_set_pipapo_match_destroy(ctx, set, m);
-
 		for_each_possible_cpu(cpu)
 			pipapo_free_scratch(m, cpu);
 		free_percpu(m->scratch);
@@ -2342,8 +2340,7 @@ static void nft_pipapo_destroy(const struct nft_ctx *ctx,
 	if (priv->clone) {
 		m = priv->clone;
 
-		if (priv->dirty)
-			nft_set_pipapo_match_destroy(ctx, set, m);
+		nft_set_pipapo_match_destroy(ctx, set, m);
 
 		for_each_possible_cpu(cpu)
 			pipapo_free_scratch(priv->clone, cpu);