> First, since we have loopback devices sorted to the end, we don't have
> to loop; we can just return the first one unless it is_loopback.
>
> Second, we should probably call pcap_freealldevs here.
...or perhaps have a static routine that finds all interface addresses,
calling a supplied callback routine for each address, and have
"pcap_findalldevs()" and "pcap_lookupdev()" call that routine, with
different callbacks.
That might let us avoid allocating anything in "pcap_lookupdev()", and
also avoid (at least on platforms lacking "getifaddrs()") bothering to
spend CPU cycles getting addresses that aren't supplied by SIOCGIFCONF.
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