[media] wl128x: add missing struct v4l2_device

This struct is now required for all video device nodes, but it was missing
in this driver.

Signed-off-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/radio/wl128x/fmdrv.h

···
 #include <linux/timer.h>
 #include <media/v4l2-ioctl.h>
 #include <media/v4l2-common.h>
+#include <media/v4l2-device.h>
 #include <media/v4l2-ctrls.h>
 
 #define FM_DRV_VERSION            "0.1.1"
···
 /* FM driver operation structure */
 struct fmdev {
 	struct video_device *radio_dev;	/* V4L2 video device pointer */
+	struct v4l2_device v4l2_dev;	/* V4L2 top level struct */
 	struct snd_card *card;	/* Card which holds FM mixer controls */
 	u16 asci_id;
 	spinlock_t rds_buff_lock; /* To protect access to RDS buffer */

drivers/media/radio/wl128x/fmdrv_v4l2.c

···
 	struct v4l2_ctrl *ctrl;
 	int ret;
 
+	strlcpy(fmdev->v4l2_dev.name, FM_DRV_NAME, sizeof(fmdev->v4l2_dev.name));
+	ret = v4l2_device_register(NULL, &fmdev->v4l2_dev);
+	if (ret < 0)
+		return ret;
+
 	/* Init mutex for core locking */
 	mutex_init(&fmdev->mutex);
 
···
 	video_set_drvdata(gradio_dev, fmdev);
 
 	gradio_dev->lock = &fmdev->mutex;
+	gradio_dev->v4l2_dev = &fmdev->v4l2_dev;
 
 	/* Register with V4L2 subsystem as RADIO device */
 	if (video_register_device(gradio_dev, VFL_TYPE_RADIO, radio_nr)) {
···
 
 	/* Unregister RADIO device from V4L2 subsystem */
 	video_unregister_device(gradio_dev);
+
+	v4l2_device_unregister(&fmdev->v4l2_dev);
 
 	return fmdev;
 }