[IPV6]: Fix two bugs in ip6_append_data changes.

- Export ip_generic_getfrag
- In udp6 increment v6 udp statistics not v4 one

net/ipv6/udp.c

@@ -1007,7 +1007,7 @@ static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg
 	fl6_sock_release(flowlabel);
 	if (saddr) kfree(saddr);
 	if (!err) {
-		UDP_INC_STATS_USER(UdpOutDatagrams);
+		UDP6_INC_STATS_USER(UdpOutDatagrams);
 		return len;
 	}
 	return err;

net/netsyms.c

@@ -467,6 +467,8 @@ EXPORT_SYMBOL(sysctl_tcp_tw_recycle);
 EXPORT_SYMBOL(sysctl_max_syn_backlog);
 #endif
 
+EXPORT_SYMBOL(ip_generic_getfrag);
+
 #endif
 
 EXPORT_SYMBOL(tcp_read_sock);