[PATCH] libertas: remove adapter->nullpktinterval

No code ever initialized this variable, so it was 0 because of kzalloc().
But no other code changes it, making it rather useless.
Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/cmd.c

@@ -73,8 +73,7 @@ static int wlan_cmd_802_11_ps_mode(wlan_private * priv,
 
 		psm->locallisteninterval =
 		    cpu_to_le16(adapter->locallisteninterval);
-		psm->nullpktinterval =
-		    cpu_to_le16(adapter->nullpktinterval);
+		psm->nullpktinterval = 0;
 		psm->multipledtim =
 		    cpu_to_le16(priv->adapter->multipledtim);
 		break;

drivers/net/wireless/libertas/dev.h

@@ -313,7 +313,6 @@ struct _wlan_adapter {
 
 	struct PS_CMD_ConfirmSleep libertas_ps_confirm_sleep;
 	u16 locallisteninterval;
-	u16 nullpktinterval;
 
 	struct assoc_request * pending_assoc_req;
 	struct assoc_request * in_progress_assoc_req;