drm/panel: xpp055c272: Make use of the helper function dev_err_probe()

When possible use dev_err_probe help to properly deal with the
PROBE_DEFER error, the benefit is that DEFER issue will be logged
in the devices_deferred debugfs file.
And using dev_err_probe() can reduce code size, the error value
gets printed.

Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210916104650.11781-1-caihuoqing@baidu.com

drivers/gpu/drm/panel/panel-xinpeng-xpp055c272.c

@@ -283,26 +283,19 @@ static int xpp055c272_probe(struct mipi_dsi_device *dsi)
 		return -ENOMEM;
 
 	ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
-	if (IS_ERR(ctx->reset_gpio)) {
-		dev_err(dev, "cannot get reset gpio\n");
-		return PTR_ERR(ctx->reset_gpio);
-	}
+	if (IS_ERR(ctx->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
+				     "cannot get reset gpio\n");
 
 	ctx->vci = devm_regulator_get(dev, "vci");
-	if (IS_ERR(ctx->vci)) {
-		ret = PTR_ERR(ctx->vci);
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev, "Failed to request vci regulator: %d\n", ret);
-		return ret;
-	}
+	if (IS_ERR(ctx->vci))
+		return dev_err_probe(dev, PTR_ERR(ctx->vci),
+				     "Failed to request vci regulator\n");
 
 	ctx->iovcc = devm_regulator_get(dev, "iovcc");
-	if (IS_ERR(ctx->iovcc)) {
-		ret = PTR_ERR(ctx->iovcc);
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
-		return ret;
-	}
+	if (IS_ERR(ctx->iovcc))
+		return dev_err_probe(dev, PTR_ERR(ctx->iovcc),
+				     "Failed to request iovcc regulator\n");
 
 	mipi_dsi_set_drvdata(dsi, ctx);