[NETFILTER]: xt_tcpudp: fix double unregistration in error path

"xt_unregister_match(AF_INET, &tcp_matchstruct)" is called twice,
leaving "udp_matchstruct" registered, in case of a failure in the
registration of the udp6 structure.
Signed-off-by: NYuri Gushin <yuri@ecl-labs.org>
Signed-off-by: NPatrick McHardy <kaber@trash.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/netfilter/xt_tcpudp.c

@@ -260,7 +260,7 @@ static int __init xt_tcpudp_init(void)
 	return ret;
 
 out_unreg_udp:
-	xt_unregister_match(&tcp_matchstruct);
+	xt_unregister_match(&udp_matchstruct);
 out_unreg_tcp6:
 	xt_unregister_match(&tcp6_matchstruct);
 out_unreg_tcp: