Description

Ipv4 addresses may be trailed by random characters(e.g. prefix length) and the parser will happily ignore it, the IPv6 address parser does not allow that.

Steps to reproduce the issue

Try to parse 192.168.0.0/24 and fc00::/56 with lrtr_ip_str_to_addr.

Expected results

Both should behave the same, ideally returning an error.

Actual results

The v4 address is parsed fine (ignoring the prefix) the v6 parser returns a error.

Since this could break existing applications I would like to discuss what we should do.
The best solution would be to return an error, but allowing trailing characters could of course also be implemented for the v6 parser to provide consistency and preserve compatibility.