46bc8561f0
dhcp6_option_parse_string is intended to clear strings with length 0,
for consistency. The data assert is too strict for this purpose, so we
will allow data || data_len == 0, similar to other dhcp6_option_parse*
helpers.
Fixes: fde788601b ("dhcp6-client: parse RFC8910 captive portal dhcp6 option")
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