[libvirt] Don't use private struct member names of in6_addr

[Matthias Bolte <matthias bolte googlemail com>]

__in6_u.__u6_addr16 is the private name for this struct member,
s6_addr16 is the public one. Our buildserver revealed this problem,
because for some reason the internal names are missing the __ prefix
there.

Matthias

diff --git a/src/util/network.c b/src/util/network.c
index abd866c..5e3cb3a 100644
--- a/src/util/network.c
+++ b/src/util/network.c
@@ -46,7 +46,7 @@ static int getIPv6Addr(virSocketAddrPtr addr, virIPv6AddrPtr tab) {
     if ((addr == NULL) || (tab == NULL) || (addr->stor.ss_family != AF_INET6))
         return(-1);
 
-    val = (virIPv6AddrPtr) &(addr->inet6.sin6_addr.__in6_u.__u6_addr16);
+    val = (virIPv6AddrPtr) &(addr->inet6.sin6_addr.s6_addr16);
 
     for (i = 0;i < 8;i++) {
         (*tab)[i] = ntohs((*val)[i]);