[nsd-users] Remove needless memory zeroing

[Stephane Bortzmeyer]

On Mon, Jan 18, 2016 at 10:46:03PM -0500,
 Michael McConville <mmcco at mykolab.com> wrote 
 a message of 24 lines which said:

> Unless I'm misunderstanding something, anonymously mmapped memory is
> always zeroed by the kernel

This is written in Linux mmap man page:

> its contents are initialized to zero

But not in FreeBSD mmap man page:

>     MAP_ANON           Map anonymous memory not associated with any specific
>                        file.  The file descriptor used for creating MAP_ANON
>                        must be -1.  The offset argument must be 0.

So, portability seems to require mmset.