[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>
diff --git a/drivers/net/wireless/libertas/cmd.c b/drivers/net/wireless/libertas/cmd.c
index 72e76e4..f5d4971 100644
--- a/drivers/net/wireless/libertas/cmd.c
+++ b/drivers/net/wireless/libertas/cmd.c
@@ -73,8 +73,7 @@
 
 		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;