netfilter: avoid double free in nf_reinject

NF_STOLEN means skb was already freed
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/netfilter/nf_queue.c

@@ -312,6 +312,7 @@ void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict)
 		}
 		break;
 	case NF_STOLEN:
+		break;
 	default:
 		kfree_skb(skb);
 	}