The call to wl1271_cmd_build_null_data() was missing when we got associated,
this was causing PS to fail.  This patch adds the call and now PS seems to
work.
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Reviewed-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
            memcmp(wl->bssid, bss_conf->bssid, ETH_ALEN)) {
                        wl->rx_config |= CFG_BSSID_FILTER_EN;
                        memcpy(wl->bssid, bss_conf->bssid, ETH_ALEN);
+                       ret = wl1271_cmd_build_null_data(wl);
+                       if (ret < 0) {
+                               wl1271_warning("cmd buld null data failed %d",
+                                              ret);
+                               goto out_sleep;
+                       }
                        ret = wl1271_cmd_join(wl);
                        if (ret < 0) {
                                wl1271_warning("cmd join failed %d", ret);