drm/panel: ls037v7dw01: 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 <[e-mail]>
Signed-off-by: Sam Ravnborg <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c

···
 	lcd->pdev = pdev;
 
 	lcd->vdd = devm_regulator_get(&pdev->dev, "envdd");
-	if (IS_ERR(lcd->vdd)) {
-		dev_err(&pdev->dev, "failed to get regulator\n");
-		return PTR_ERR(lcd->vdd);
-	}
+	if (IS_ERR(lcd->vdd))
+		return dev_err_probe(&pdev->dev, PTR_ERR(lcd->vdd),
+				     "failed to get regulator\n");
 
 	lcd->ini_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);
-	if (IS_ERR(lcd->ini_gpio)) {
-		dev_err(&pdev->dev, "failed to get enable gpio\n");
-		return PTR_ERR(lcd->ini_gpio);
-	}
+	if (IS_ERR(lcd->ini_gpio))
+		return dev_err_probe(&pdev->dev, PTR_ERR(lcd->ini_gpio),
+				     "failed to get enable gpio\n");
 
 	lcd->resb_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
-	if (IS_ERR(lcd->resb_gpio)) {
-		dev_err(&pdev->dev, "failed to get reset gpio\n");
-		return PTR_ERR(lcd->resb_gpio);
-	}
+	if (IS_ERR(lcd->resb_gpio))
+		return dev_err_probe(&pdev->dev, PTR_ERR(lcd->resb_gpio),
+				     "failed to get reset gpio\n");
 
 	lcd->mo_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 0,
 					    GPIOD_OUT_LOW);