backlight: as3711_bl: Handle deferred probe

Don't pollute dmesg on deferred probe and simplify the code with
dev_err_probe().

Reviewed-by: Daniel Thompson <[e-mail]>
Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/video/backlight/as3711_bl.c

···
 
 	if (pdev->dev.parent->of_node) {
 		ret = as3711_backlight_parse_dt(&pdev->dev);
-		if (ret < 0) {
-			dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
-			return ret;
-		}
+		if (ret < 0)
+			return dev_err_probe(&pdev->dev, ret, "DT parsing failed\n");
 	}
 
 	if (!pdata->su1_fb && !pdata->su2_fb) {