Dear Maintainer,

With the following I'm getting the "Address type" as expected:

```
$ echo "ff02::123" | ipv6calc -i
Address type: multicast, link-local
Registry for address: reserved(RFC4291#2.7)
Interface identifier: 0000:0000:0000:0123
Interface identifier is probably manual set
```

However when setting the transient flag then ipv6calc is not able to
detect it as link-local anymore:

```
$ echo "ff12::123" | ipv6calc -i
Address type: multicast
Registry for address: reserved(RFC4291#2.7)
```

I would have expected an "Address type" with "link-local" in the second
example, similar to the output of the first command

Regards, Linus