Add comment about requiring pointers to memory block to be NULL if the corresponding length is 0, non-NULL otherwise.
Add comment about requiring pointers to memory block to be NULL if the
corresponding length is 0, non-NULL otherwise.

pecharmin/bind9,pecharmin/bind9,pecharmin/bind9,pecharmin/bind9,pecharmin/bind9,pecharmin/bind9,each/bind9-collab,each/bind9-collab,each/bind9-collab,each/bind9-collab,each/bind9-collab,each/bind9-collab