(previous variant return NULL pointer for both empty file case and error case,
so caller can't sense error properly).
It not affect existen programs because property_find() now returns NULL
for both NULL pointer and NULLified struct.
that applications know how large of a buffer they must allocate before
calling property_find(). Also added a $FreeBSD$ tag while I'm here.
Approved by: jkh
I'll convert sysinstall to use shortly) and a simple call which uses
this mechanism to implement an /etc/auth.conf file. I'll let Mark Murray
handle the format and checkin of the sample auth.conf file.
Reviewed by: markm
