vx222: treat firmware data as const

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

sound/pci/vx222/vx222_ops.c

@@ -359,7 +359,7 @@ static int vx2_load_xilinx_binary(struct vx_core *chip, const struct firmware *x
 {
 	unsigned int i;
 	unsigned int port;
-	unsigned char *image;
+	const unsigned char *image;
 
 	/* XILINX reset (wait at least 1 milisecond between reset on and off). */
 	vx_outl(chip, CNTRL, VX_CNTRL_REGISTER_VALUE | VX_XILINX_RESET_MASK);