netfilter: nfnetlink_queue: just returns error for unknown command

This patch stops processing options for unknown command.

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 57951ce..c1f6df4 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -1182,7 +1182,7 @@
 			break;
 		default:
 			ret = -ENOTSUPP;
-			break;
+			goto err_out_unlock;
 		}
 	}