media: i2c: ov2685: Add print for power on write failed

If the sensor doens't power up correctly, for example due to incorrect
devicetree description, the power up i2c writes will fail.

Add an error print for this situation.
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/i2c/ov2685.c

@@ -419,8 +419,10 @@ static int __ov2685_power_on(struct ov2685 *ov2685)
 	 * writing register before .s_stream() as a workaround
 	 */
 	ret = ov2685_write_array(ov2685->client, ov2685->cur_mode->reg_list);
-	if (ret)
+	if (ret) {
+		dev_err(dev, "Failed to set regs for power on\n");
 		goto disable_supplies;
+	}
 
 	return 0;