virtio_fs: add informative log for new tag discovery

Enhance the device probing process by adding a log message when a new
virtio-fs tag is successfully discovered. This improvement provides
better visibility into the initialization of virtio-fs devices.

Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Message-Id: <20241006184324.8497-1-mgurtovoy@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

fs/fuse/virtio_fs.c

@@ -521,6 +521,7 @@ static int virtio_fs_read_tag(struct virtio_device *vdev, struct virtio_fs *fs)
 		return -EINVAL;
 	}
 
+	dev_info(&vdev->dev, "discovered new tag: %s\n", fs->tag);
 	return 0;
 }