Wakeonlan v0.41 (Debian12) - IPv6 issue

Debian 12 wakeonlan currently fails when attempting to use IPv6 addresses
```
wakeonlan -p 9 -i fd01:0:0:f::3 04:44:44:44:44:40
Can't call method "addr" on an undefined value at /usr/bin/wakeonlan line 117.
```

I'm not familiar with perl, but `gethostbyname` would imply the program thinks the IPv6 address is a domain name?

