dell_rbu: firmware data is const

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/drivers/firmware/dell_rbu.c b/drivers/firmware/dell_rbu.c
index 6a8b1e0..7430e21 100644
--- a/drivers/firmware/dell_rbu.c
+++ b/drivers/firmware/dell_rbu.c
@@ -220,7 +220,7 @@
 	return retval;
 }
 
-static int packetize_data(void *data, size_t length)
+static int packetize_data(const u8 *data, size_t length)
 {
 	int rc = 0;
 	int done = 0;