For DHCPv6, the second entry of a lease is the IAID. The parsing code
expects a MAC instead of a IAID.
Reported-by: Hartmut Birr <e9hack@gmail.com>
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Checking the return value of uci_lookup_ptr() is not enough to ensure that
the requested optiomn has actually been found.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>