Comment # 3 on bug 1139983 from Stanislav Brabec

Actually, the whole heuristic just picks a proper interface.

It contains no heuristic for a proper IP address of the interface. It just
prints the first one.

getifaddrs() returns linked list of struct ifaddrs.
for (p = addrs; p; p = p->ifa_next)
goex through addresses, but once any single address is found (if (addr)), it is
printed and function returns. If I comment out the "return" there, it will
print all addresses.

We always need to go through all returned addresses and pick the most proper
one.