nvlist_next_nvpair
nvpair_t *nvlist_next_nvpair(const nvlist_t *nvl, const nvpair_t *nvp);
nvp = nvlist_next_nvpair(nvl, *cookiep);
nvp = nvlist_next_nvpair(nvl, nvp)) {
nvp = nvlist_next_nvpair(nvl, nvp)) {
while ((nvp = nvlist_next_nvpair(nvl, nvp)) == NULL) {
while ((nvp = nvlist_next_nvpair(nvl, nvp)) == NULL) {