drm/exynos: Search for TE-gpio in DSI panel's node

TE-gpio, if defined, is placed in the panel's node, not the parent DSI
node. Change the devm_gpiod_get_optional() to gpiod_get_optional() and
pass proper device node to it. The code already has a proper cleanup
path, so it looks that the devm_* variant has been applied accidentally
during the conversion to gpiod API.

Fixes: ee6c8b5afa62 ("drm/exynos: Replace legacy gpio interface for gpiod interface")
Signed-off-by: Marek Szyprowski <[e-mail]>
Fixed a typo.
Signed-off-by: Inki Dae <[e-mail]>

drivers/gpu/drm/exynos/exynos_drm_dsi.c

···
 	int ret;
 	int te_gpio_irq;
 
-	dsi->te_gpio = devm_gpiod_get_optional(dsi->dev, "te", GPIOD_IN);
+	dsi->te_gpio = gpiod_get_optional(panel, "te", GPIOD_IN);
 	if (!dsi->te_gpio) {
 		return 0;
 	} else if (IS_ERR(dsi->te_gpio)) {