[aravis] gv_interface: fix crash when non INET interface available.

[Emmanuel Pacaud <emmanuel src gnome org>]

commit a668657793ef183748b42c1ed44ac0454f87c87d
Author: Toby Collett <thjc plan9 net nz>
Date:   Tue Oct 22 16:39:32 2013 +0200

    gv_interface: fix crash when non INET interface available.
    
    Fix https://bugzilla.gnome.org/show_bug.cgi?id=710606

 src/arvgvinterface.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/arvgvinterface.c b/src/arvgvinterface.c
index e5dddc9..78f03c0 100644
--- a/src/arvgvinterface.c
+++ b/src/arvgvinterface.c
@@ -83,6 +83,7 @@ arv_gv_discover_socket_list_new (void)
        for (ifap_iter = ifap; ifap_iter != NULL; ifap_iter = ifap_iter->ifa_next) {
                if ((ifap_iter->ifa_flags & IFF_UP) != 0 &&
                    (ifap_iter->ifa_flags & IFF_POINTOPOINT) == 0 &&
+                   (ifap_iter->ifa_addr != NULL) &&
                    (ifap_iter->ifa_addr->sa_family == AF_INET)) {
                        ArvGvDiscoverSocket *discover_socket = g_new0 (ArvGvDiscoverSocket, 1);
                        GSocketAddress *socket_address;