drm/fbdev-generic: Initialize fb-helper structure in generic setup

Initialize the fb-helper structure immediately after its allocation
in drm_fbdev_generic_setup(). That will make it easier to fill it with
driver-specific values, such as the preferred BPP.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230125200415.14123-5-tzimmermann@suse.de

drivers/gpu/drm/drm_fbdev_generic.c

@@ -385,8 +385,6 @@ static int drm_fbdev_client_hotplug(struct drm_client_dev *client)
 	if (dev->fb_helper)
 		return drm_fb_helper_hotplug_event(dev->fb_helper);
 
-	drm_fb_helper_prepare(dev, fb_helper, &drm_fb_helper_generic_funcs);
-
 	ret = drm_fb_helper_init(dev, fb_helper);
 	if (ret)
 		goto err;
@@ -456,12 +454,12 @@ void drm_fbdev_generic_setup(struct drm_device *dev,
 	fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
 	if (!fb_helper)
 		return;
+	drm_fb_helper_prepare(dev, fb_helper, &drm_fb_helper_generic_funcs);
 
 	ret = drm_client_init(dev, &fb_helper->client, "fbdev", &drm_fbdev_client_funcs);
 	if (ret) {
-		kfree(fb_helper);
 		drm_err(dev, "Failed to register client: %d\n", ret);
-		return;
+		goto err_drm_client_init;
 	}
 
 	/*
@@ -484,5 +482,12 @@ void drm_fbdev_generic_setup(struct drm_device *dev,
 		drm_dbg_kms(dev, "client hotplug ret=%d\n", ret);
 
 	drm_client_register(&fb_helper->client);
+
+	return;
+
+err_drm_client_init:
+	drm_fb_helper_unprepare(fb_helper);
+	kfree(fb_helper);
+	return;
 }
 EXPORT_SYMBOL(drm_fbdev_generic_setup);