libertas: convert adhoc operations to direct commands

with fixes for v9 and later firmware too.

Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/libertas/wext.c b/drivers/net/wireless/libertas/wext.c
index 4307090..426f1fe 100644
--- a/drivers/net/wireless/libertas/wext.c
+++ b/drivers/net/wireless/libertas/wext.c
@@ -966,7 +966,7 @@
 						     priv->curbssparams.bssid,
 						     WLAN_REASON_DEAUTH_LEAVING);
 		else if (priv->mode == IW_MODE_ADHOC)
-			lbs_stop_adhoc_network(priv);
+			lbs_adhoc_stop(priv);
 	}
 	lbs_mesh_config(priv, CMD_ACT_MESH_CONFIG_START, fwrq->m);
 	lbs_update_channel(priv);