ctld: Fix assertion against the wrong field

[asomers]

I guess this is OK, but I haven't ever done anything with the discovery code, so I don't know how it's supposed to work.

[imp]

yea, this field is a pointer.

[jhb]

usr.sbin/ctld/discovery.c

164

As Warner noted, pg_discovery_filter is an integer field that holds one of the PG_FILTER_* values (an enum in essence), while pg_discovery_auth_group is a pointer to a struct auth_group. This is a type mismatch comparing a pointer to an integer. Not sure why the compiler didn't complain about this earlier. Maybe if PG_FILTER_UNKNOWN is 0 then it gets treated as NULL.

166

Here you can see the PG_FILTER_ values being compared against the integer field.

183

Here you can see the pointer dereferenced.