netfilter: ipset: add missing break statemtns in ip_set_get_ip_port()

Don't fall through in the switch statement, otherwise IPv4 headers
are incorrectly parsed again as IPv6 and the return value will always
be 'false'.
Signed-off-by: Patrick McHardy <kaber@trash.net>

net/netfilter/ipset/ip_set_getport.c

@@ -118,8 +118,10 @@ ip_set_get_ip_port(const struct sk_buff *skb, u8 pf, bool src, __be16 *port)
 	switch (pf) {
 	case AF_INET:
 		ret = ip_set_get_ip4_port(skb, src, port, &proto);
+		break;
 	case AF_INET6:
 		ret = ip_set_get_ip6_port(skb, src, port, &proto);
+		break;
 	default:
 		return false;
 	}