wlcore: spi: Use dev_err_probe()

Use the existing dev_err_probe() helper instead of open-coding the same
operation.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Kalle Valo <[e-mail]>
Link: https://lore.kernel.org/r/465e7[e-mail]

drivers/net/wireless/ti/wlcore/spi.c

···
 	spi->bits_per_word = 32;
 
 	glue->reg = devm_regulator_get(&spi->dev, "vwlan");
-	if (PTR_ERR(glue->reg) == -EPROBE_DEFER)
-		return -EPROBE_DEFER;
-	if (IS_ERR(glue->reg)) {
-		dev_err(glue->dev, "can't get regulator\n");
-		return PTR_ERR(glue->reg);
-	}
+	if (IS_ERR(glue->reg))
+		return dev_err_probe(glue->dev, PTR_ERR(glue->reg),
+				     "can't get regulator\n");
 
 	ret = wlcore_probe_of(spi, glue, pdev_data);
 	if (ret) {