netfilter: nf_tables: allow expressions to return STOLEN

Currently not supported, we'd oops as skb was (or is) free'd elsewhere.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_tables_core.c

@@ -178,6 +178,7 @@ nft_do_chain(struct nft_pktinfo *pkt, void *priv)
 	case NF_ACCEPT:
 	case NF_DROP:
 	case NF_QUEUE:
+	case NF_STOLEN:
 		nft_trace_packet(&info, chain, rule,
 				 rulenum, NFT_TRACETYPE_RULE);
 		return regs.verdict.code;