panel/samsung-ld9040: 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/20[e-mail]
Signed-off-by: Maxime Ripard <[e-mail]>

drivers/gpu/drm/panel/panel-samsung-ld9040.c

···
 	struct ld9040 *ctx;
 	int ret;
 
-	ctx = devm_kzalloc(dev, sizeof(struct ld9040), GFP_KERNEL);
-	if (!ctx)
-		return -ENOMEM;
+	ctx = devm_drm_panel_alloc(dev, struct ld9040, panel,
+				   &ld9040_drm_funcs,
+				   DRM_MODE_CONNECTOR_DPI);
+	if (IS_ERR(ctx))
+		return PTR_ERR(ctx);
 
 	spi_set_drvdata(spi, ctx);
 
···
 		dev_err(dev, "spi setup failed.\n");
 		return ret;
 	}
-
-	drm_panel_init(&ctx->panel, dev, &ld9040_drm_funcs,
-		       DRM_MODE_CONNECTOR_DPI);
 
 	bldev = devm_backlight_device_register(dev, dev_name(dev), dev,
 					       ctx, &ld9040_bl_ops,