ipw2200: prepare for const netdev->dev_addr

netdev->dev_addr will be come const soon, constify the argument
to command send to avoid compiler warnings.

Signed-off-by: Jakub Kicinski <[e-mail]>
Signed-off-by: Kalle Valo <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/net/wireless/intel/ipw2x00/ipw2200.c

···
 				struct clx2_tx_queue *txq, int qindex);
 static int ipw_queue_reset(struct ipw_priv *priv);
 
-static int ipw_queue_tx_hcmd(struct ipw_priv *priv, int hcmd, void *buf,
+static int ipw_queue_tx_hcmd(struct ipw_priv *priv, int hcmd, const void *buf,
 			     int len, int sync);
 
 static void ipw_tx_queue_free(struct ipw_priv *);
···
 }
 
 static int ipw_send_cmd_pdu(struct ipw_priv *priv, u8 command, u8 len,
-			    void *data)
+			    const void *data)
 {
 	struct host_cmd cmd = {
 		.cmd = command,
···
 	return used;
 }
 
-static int ipw_queue_tx_hcmd(struct ipw_priv *priv, int hcmd, void *buf,
+static int ipw_queue_tx_hcmd(struct ipw_priv *priv, int hcmd, const void *buf,
 			     int len, int sync)
 {
 	struct clx2_tx_queue *txq = &priv->txq_cmd;

drivers/net/wireless/intel/ipw2x00/ipw2200.h

···
 	u8 cmd;
 	u8 len;
 	u16 reserved;
-	u32 *param;
+	const u32 *param;
 } __packed;	/* XXX */
 
 struct cmdlog_host_cmd {