drm/tegra: Fix gpiod_get_from_of_node() regression

That function now returns ERR_PTR instead of NULL if "hpd-gpio" is not
present in device-tree. The offending patch missed to adapt the Tegra's
DRM driver for the API change.

Fixes: 025bf377 ("gpio: Fix return value mismatch of function gpiod_get_from_of_node()")
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/output.c

@@ -126,9 +126,13 @@ int tegra_output_probe(struct tegra_output *output)
 						       "nvidia,hpd-gpio", 0,
 						       GPIOD_IN,
 						       "HDMI hotplug detect");
-	if (IS_ERR(output->hpd_gpio))
+	if (IS_ERR(output->hpd_gpio)) {
+		if (PTR_ERR(output->hpd_gpio) != -ENOENT)
 			return PTR_ERR(output->hpd_gpio);
 
+		output->hpd_gpio = NULL;
+	}
+
 	if (output->hpd_gpio) {
 		err = gpiod_to_irq(output->hpd_gpio);
 		if (err < 0) {