sparx5_lg_get_first
itr = sparx5_lg_get_first(sparx5, layer, group);
return idx == sparx5_lg_get_first(sparx5, layer, group);
return sparx5_lg_get_first(sparx5, layer, group) ==
itr = sparx5_lg_get_first(sparx5, layer, i);
*first = sparx5_lg_get_first(sparx5, layer, group);
next = sparx5_lg_get_first(sparx5, layer, new_group);