netfilter: nfnetlink_queue: don't handle options after unbind

This patch stops processing after destroying a queue instance.

Signed-off-by: Ken-ichirou MATSUZAWA <chamas@h4.dion.ne.jp>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index fe360f7..57951ce 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -1176,7 +1176,7 @@
 				goto err_out_unlock;
 			}
 			instance_destroy(q, queue);
-			break;
+			goto err_out_unlock;
 		case NFQNL_CFG_CMD_PF_BIND:
 		case NFQNL_CFG_CMD_PF_UNBIND:
 			break;