netfilter: nfnetlink_log: 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_log.c b/net/netfilter/nfnetlink_log.c
index 6a57f10..8ca9320 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -888,7 +888,7 @@
 			goto out_put;
 		default:
 			ret = -ENOTSUPP;
-			break;
+			goto out_put;
 		}
 	} else if (!inst) {
 		ret = -ENODEV;