assert in inet_ntop_ez()

The nbase/nbase_misc.c at line 153:

#if HAVE_IPV6
  else {
    assert(sin->sin_family == AF_INET6);

gets an assert on Win32 if you have an interface that is down. In my case
it's a WiFi-adapter in ad-hoc mode. IMHO it would be okay for
inet_ntop_ez() to return NULL if 'sin->sin_family' is 0. Patch attached.

PS. The interace list of "nmap --iflist" looks like this here:
Starting Nmap 4.21ALPHA2 ( http://insecure.org ) at 2007-01-24 11:06 GMT
************************INTERFACES************************
DEV (SHORT) IP/MASK TYPE UP MAC
eth0 (eth0) (null)/0 ethernet down 00:18:4D:00:DE:76
tr0 (tr0) 192.168.0.1/24 other up
eth1 (eth1) 10.0.0.6/24 ethernet up 00:01:80:0C:70:B2
lo0 (lo0) 127.0.0.1/8 loopback up

--gv

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