iio: adc: rcar-gyroadc: Simplify with dev_err_probe()

Common pattern of handling deferred probe can be simplified with
dev_err_probe(). Less code and also it prints the error value.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/adc/rcar-gyroadc.c

···
 		return PTR_ERR(priv->regs);
 
 	priv->clk = devm_clk_get(dev, "fck");
-	if (IS_ERR(priv->clk)) {
-		ret = PTR_ERR(priv->clk);
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev, "Failed to get IF clock (ret=%i)\n", ret);
-		return ret;
-	}
+	if (IS_ERR(priv->clk))
+		return dev_err_probe(dev, PTR_ERR(priv->clk),
+				     "Failed to get IF clock\n");
 
 	ret = rcar_gyroadc_parse_subdevs(indio_dev);
 	if (ret)