drm: omapdrm: dpi: Don't treat GPIO probe deferral as an error

There's no need to print an error message on probe deferral, that's a
normal situation. Probe deferral debugging can be performed by enabling
the related debug messages in the drivers core.
Signed-off-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: NSebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/displays/encoder-tfp410.c

@@ -173,6 +173,7 @@ static int tfp410_probe_of(struct platform_device *pdev)
 	if (gpio_is_valid(gpio) || gpio == -ENOENT) {
 		ddata->pd_gpio = gpio;
 	} else {
+		if (gpio != -EPROBE_DEFER)
 			dev_err(&pdev->dev, "failed to parse PD gpio\n");
 		return gpio;
 	}