bt8xx: treat firmware data as const

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/drivers/media/video/bt8xx/bttv-cards.c b/drivers/media/video/bt8xx/bttv-cards.c
index 8ef0424..1c56ae9 100644
--- a/drivers/media/video/bt8xx/bttv-cards.c
+++ b/drivers/media/video/bt8xx/bttv-cards.c
@@ -3768,7 +3768,8 @@
 #define BTTV_ALT_DCLK		0x100000
 #define BTTV_ALT_NCONFIG	0x800000
 
-static int __devinit pvr_altera_load(struct bttv *btv, u8 *micro, u32 microlen)
+static int __devinit pvr_altera_load(struct bttv *btv, const u8 *micro,
+				     u32 microlen)
 {
 	u32 n;
 	u8 bits;