wpi_node
struct wpi_node *wn = (struct wpi_node *)ni;
struct wpi_node *wn = (struct wpi_node *)data->ni;
struct wpi_node *wn;
wn = malloc(sizeof (struct wpi_node), M_80211_NODE, M_NOWAIT | M_ZERO);
ieee80211_amrr_node_init(&sc->amrr, &((struct wpi_node *)ni)->amn);