libertas: make lbs_cmd() usage nicer

Define a macro that relieves the caller from having to use sizeof on
the command structure when calling lbs_cmd(), and move the prototype
of __lbs_cmd() to a new cmd.h file.

Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/cmd.h

@@ -0,0 +1,16 @@
+/* Copyright (C) 2007, Red Hat, Inc. */
+
+#ifndef _LBS_CMD_H_
+#define _LBS_CMD_H_
+
+#include "hostcmd.h"
+#include "dev.h"
+
+#define lbs_cmd(priv, cmdnr, cmd, callback, callback_arg) \
+	__lbs_cmd(priv, cmdnr, &cmd, sizeof(cmd), callback, callback_arg)
+
+int __lbs_cmd(struct lbs_private *priv, uint16_t command, void *cmd, int cmd_size, 
+	      int (*callback)(struct lbs_private *, unsigned long, struct cmd_ds_command *),
+	      unsigned long callback_arg);
+
+#endif /* _LBS_CMD_H */