media: ov772x: omit consumer ID when getting clock reference

Currently the ov772x driver obtains a clock with a specific consumer ID.
As there's a single clock for this driver, we could omit clock-names
property in device tree by passing NULL as a consumer ID to clk_get().

Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Hans Verkuil <hans.verkuil@cisco.com>
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

arch/sh/boards/mach-migor/setup.c

@@ -593,7 +593,7 @@ static int __init migor_devices_setup(void)
 	}
 
 	/* Add a clock alias for ov7725 xclk source. */
-	clk_add_alias("xclk", "0-0021", "video_clk", NULL);
+	clk_add_alias(NULL, "0-0021", "video_clk", NULL);
 
 	/* Register GPIOs for video sources. */
 	gpiod_add_lookup_table(&ov7725_gpios);

drivers/media/i2c/ov772x.c

@@ -1300,7 +1300,7 @@ static int ov772x_probe(struct i2c_client *client,
 	if (priv->hdl.error)
 		return priv->hdl.error;
 
-	priv->clk = clk_get(&client->dev, "xclk");
+	priv->clk = clk_get(&client->dev, NULL);
 	if (IS_ERR(priv->clk)) {
 		dev_err(&client->dev, "Unable to get xclk clock\n");
 		ret = PTR_ERR(priv->clk);