ok deraadt@

into /var/db/host.random at shutdown time, so we can make use of it
during reboot to seed our random pool. ok millert@ angelos@ niklas@

* except when it is escaped with a `\' at the end of the line
- fix remaining .Nm usage as well
- this is from a patch I received from kwesterback@home.com, who has been
working on some scripts for fixing formatting errors in mdoc'd man pages
Ok, so there could be a cost/benefit debate with this commit, but since I have
the patch we might as well commit it...

it's not supposed to be a hyphen/dash

Out of the approximately 1450 man pages, only about 90 of them were wrong.
Thanks to kwesterback@home.com for coming up with a script and patch to repair
this. The patch also inserted a .Os macro in the few man pages that were
missing one.

not "Month, ##, ####"

kern.arandom.

ones that are useful for all protocols, not just IPv6).

keeps us from misbehaving if the user gives us a src string that is not
NUL-terminated.  This is one of those "should not happen" cases but it
is good to play it safe.  Pointed out by Casper Dik <casper@holland.sun.com>

__null is a magic constant of integral type that converts to a null pointer
as should be, but warns for ambiguity when used to resolved an overload
between an integral type and a pointer type.