nv_addv
static void nv_addv(struct nv *nv, const unsigned char *value, size_t vsize,
nv_addv(nv, (unsigned char *)&value, sizeof(value), \
nv_addv(nv, (const unsigned char *)value, \
nv_addv(nv, (const unsigned char *)value, size, NV_TYPE_STRING,