libertas: kill pdata_buf member of struct cmd_ctrl_node

We can use the callback_arg for it; that's the way we're heading anyway...

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
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 e7f07c3..f2e027b 100644
--- a/drivers/net/wireless/libertas/cmd.c
+++ b/drivers/net/wireless/libertas/cmd.c
@@ -1280,7 +1280,6 @@
 	if (!cmdnode)
 		goto out;
 
-	cmdnode->pdata_buf = NULL;
 	cmdnode->callback = NULL;
 	cmdnode->callback_arg = 0;
 
@@ -1801,9 +1800,8 @@
 	if (!ptempnode)
 		return;
 
-	ptempnode->pdata_buf = pdata_buf;
 	ptempnode->callback = NULL;
-	ptempnode->callback_arg = 0;
+	ptempnode->callback_arg = (unsigned long)pdata_buf;
 
 	lbs_deb_leave(LBS_DEB_HOST);
 }