drm/panel: himax-hx83102: If prepare fails, disable GPIO before regulators

The enable GPIO should clearly be set low before turning off
regulators. That matches both the inverse order that things were
enabled and also the order in unprepare().

Fixes: 0ef94554 ("drm/panel: himax-hx83102: Break out as separate driver")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20240517143643.6.Id0659a80147cf51e0ebb8fe7fee18db86851960d@changeidSigned-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240517143643.6.Id0659a80147cf51e0ebb8fe7fee18db86851960d@changeid

drivers/gpu/drm/panel/panel-himax-hx83102.c

@@ -578,13 +578,13 @@ static int hx83102_prepare(struct drm_panel *panel)
 	return 0;
 
 poweroff:
+	gpiod_set_value(ctx->enable_gpio, 0);
 	regulator_disable(ctx->avee);
 poweroffavdd:
 	regulator_disable(ctx->avdd);
 poweroff1v8:
 	usleep_range(5000, 7000);
 	regulator_disable(ctx->pp1800);
-	gpiod_set_value(ctx->enable_gpio, 0);
 
 	return ret;
 }