rt2x00: treat firmware data as const

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index b4bf1e09..a74e1a5 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -511,8 +511,8 @@
 	 */
 	int (*probe_hw) (struct rt2x00_dev *rt2x00dev);
 	char *(*get_firmware_name) (struct rt2x00_dev *rt2x00dev);
-	u16 (*get_firmware_crc) (void *data, const size_t len);
-	int (*load_firmware) (struct rt2x00_dev *rt2x00dev, void *data,
+	u16 (*get_firmware_crc) (const void *data, const size_t len);
+	int (*load_firmware) (struct rt2x00_dev *rt2x00dev, const void *data,
 			      const size_t len);
 
 	/*