When examining interfaces to find an address, discard non-up ones.

Patch from "hantwister" on trac. Fixes bug #9904; bugfix on
0.2.3.11-alpha.

changes/bug9904

@@ -0,0 +1,4 @@
+  o Minor bugfixes:
+    - When examining list of network interfaces to find our address, do
+      not consider non-running or disabled network interfaces. Fixes bug
+      9904; bugfix on 0.2.3.11-alpha. Patch from "hantwister".

src/common/address.c

@@ -1187,6 +1187,8 @@ get_interface_addresses_raw(int severity)
   result = smartlist_new();
   for (i = ifa; i; i = i->ifa_next) {
     tor_addr_t tmp;
+    if ((i->ifa_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
+      continue;
     if (!i->ifa_addr)
       continue;
     if (i->ifa_addr->sa_family != AF_INET &&