drm: bridge: adv7511: Add check for mipi_dsi_driver_register

As mipi_dsi_driver_register could return error if fails,
it should be better to check the return value and return error
if fails.
Moreover, if i2c_add_driver fails,  mipi_dsi_driver_register
should be reverted.

Fixes: 1e4d58cd ("drm/bridge: adv7533: Create a MIPI DSI device")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220602103401.2980938-1-jiasheng@iscas.ac.cn

drivers/gpu/drm/bridge/adv7511/adv7511_drv.c

@@ -1393,10 +1393,21 @@ static struct i2c_driver adv7511_driver = {
 
 static int __init adv7511_init(void)
 {
+	int ret;
+
+	if (IS_ENABLED(CONFIG_DRM_MIPI_DSI)) {
+		ret = mipi_dsi_driver_register(&adv7533_dsi_driver);
+		if (ret)
+			return ret;
+	}
+
+	ret = i2c_add_driver(&adv7511_driver);
+	if (ret) {
 		if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
-		mipi_dsi_driver_register(&adv7533_dsi_driver);
+			mipi_dsi_driver_unregister(&adv7533_dsi_driver);
+	}
 
-	return i2c_add_driver(&adv7511_driver);
+	return ret;
 }
 module_init(adv7511_init);