_kvm_reallocarray
where = _kvm_reallocarray(kd, kd->filebase, nfiles, esize);
where = _kvm_reallocarray(kd, kd->filebase, nfiles + 10, esize);
void *_kvm_reallocarray(kvm_t *kd, void *, size_t, size_t);
argv = _kvm_reallocarray(kd, *pargv, argc, sizeof(**pargv));
newp = _kvm_reallocarray(kd, *pargspc,
buf = _kvm_reallocarray(kd, *pargbuf, orglen, 2);
kd->procbase = _kvm_reallocarray(kd, NULL, maxthread, esize);