calloc(), and realloc().  Idea from NetBSD.

(K&R-style type promotions are evil),

their own malloc() implementation.

didn't do so for us.  By default, malloc() zeros out the space it
allocates but the programmer cannot rely on this as it is implementation-
specific (and configurable via /etc/malloc.conf)

- avoid .Xref to one's own manpage

from conversations between various people

message :-)

.Li ... -> \&...

ok deraadt@

* 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.