[media] ov2640: Check the return value from clk_prepare_enable()

clk_prepare_enable() may fail, so we should better check its return value
and propagate it in the case of error.
Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: NSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/i2c/ov2640.c

@@ -1108,7 +1108,9 @@ static int ov2640_probe(struct i2c_client *client,
 		priv->clk = devm_clk_get(&client->dev, "xvclk");
 		if (IS_ERR(priv->clk))
 			return PTR_ERR(priv->clk);
-		clk_prepare_enable(priv->clk);
+		ret = clk_prepare_enable(priv->clk);
+		if (ret)
+			return ret;
 	}
 
 	ret = ov2640_probe_dt(client, priv);