panel/ltk050h3146w: 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-leadtek-ltk050h3146w.c

···
 	struct ltk050h3146w *ctx;
 	int ret;
 
-	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
-	if (!ctx)
-		return -ENOMEM;
+	ctx = devm_drm_panel_alloc(dev, struct ltk050h3146w, panel,
+				   &ltk050h3146w_funcs,
+				   DRM_MODE_CONNECTOR_DSI);
+	if (IS_ERR(ctx))
+		return PTR_ERR(ctx);
 
 	ctx->panel_desc = of_device_get_match_data(dev);
 	if (!ctx->panel_desc)
···
 	dsi->lanes = 4;
 	dsi->format = MIPI_DSI_FMT_RGB888;
 	dsi->mode_flags = ctx->panel_desc->mode_flags;
-
-	drm_panel_init(&ctx->panel, &dsi->dev, &ltk050h3146w_funcs,
-		       DRM_MODE_CONNECTOR_DSI);
 
 	ret = drm_panel_of_backlight(&ctx->panel);
 	if (ret)