panel/lcd-olinuxino: Use refcounted allocation in place of devm_kzalloc()

Move to using the new API devm_drm_panel_alloc() to allocate the
panel.

Reviewed-by: Neil Armstrong <[e-mail]>
Signed-off-by: Anusha Srivatsa <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Maxime Ripard <[e-mail]>

drivers/gpu/drm/panel/panel-olimex-lcd-olinuxino.c

···
 				     I2C_FUNC_SMBUS_READ_I2C_BLOCK))
 		return -ENODEV;
 
-	lcd = devm_kzalloc(dev, sizeof(*lcd), GFP_KERNEL);
-	if (!lcd)
-		return -ENOMEM;
+	lcd = devm_drm_panel_alloc(dev, struct lcd_olinuxino, panel,
+				   &lcd_olinuxino_funcs,
+				   DRM_MODE_CONNECTOR_DPI);
+	if (IS_ERR(lcd))
+		return PTR_ERR(lcd);
 
 	i2c_set_clientdata(client, lcd);
 	lcd->dev = dev;
···
 	lcd->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
 	if (IS_ERR(lcd->enable_gpio))
 		return PTR_ERR(lcd->enable_gpio);
-
-	drm_panel_init(&lcd->panel, dev, &lcd_olinuxino_funcs,
-		       DRM_MODE_CONNECTOR_DPI);
 
 	ret = drm_panel_of_backlight(&lcd->panel);
 	if (ret)