833c2aebb4
After a short correspondence with Otto Moerbeek it turned out mallocarray() is only in the OpenBSD-Kernel, because the kernel- malloc doesn't have realloc. Userspace applications should rather use reallocarray with an explicit NULL-pointer. Assuming reallocarray() will become available in c-stdlibs in the next few years, we nip mallocarray() in the bud to allow an easy transition to a system-provided version when the day comes.