libertas: treat firmware data as const

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/drivers/net/wireless/libertas/if_usb.c b/drivers/net/wireless/libertas/if_usb.c
index 36288b2..4dcd409 100644
--- a/drivers/net/wireless/libertas/if_usb.c
+++ b/drivers/net/wireless/libertas/if_usb.c
@@ -293,7 +293,7 @@
 static int if_usb_send_fw_pkt(struct if_usb_card *cardp)
 {
 	struct fwdata *fwdata = cardp->ep_out_buf;
-	uint8_t *firmware = cardp->fw->data;
+	const uint8_t *firmware = cardp->fw->data;
 
 	/* If we got a CRC failure on the last block, back
 	   up and retry it */
@@ -746,7 +746,7 @@
  *         len               image length
  *  @return     0 or -1
  */
-static int check_fwfile_format(uint8_t *data, uint32_t totlen)
+static int check_fwfile_format(const uint8_t *data, uint32_t totlen)
 {
 	uint32_t bincmd, exit;
 	uint32_t blksize, offset, len;