The manpage for reallocarray is missing in version 0.7.0
This one: http://www.openbsd.org/cgi-bin/man.cgi?query=reallocarray&apropos=0&sec=0&arch=default&manpath=OpenBSD-current
Ah indeed, I had noticed some weeks ago, but it seems I lost track of it.
Thanks for the reminder. I've adapted the OpenBSD malloc.3 man page and it
will be included in the next libbsd release.
This has now been released as part of libbsd 0.8.0.