[media] mem2mem: set missing v4l2_dev pointer

The m2m-deinterlace, mem2mem_testdev and mx2_emmaprp drivers didn't set
the v4l2_dev pointer in struct video_device, even though a v4l2_device was
registered correctly. These days this v4l2_dev pointer must be set correctly,
so this patch adds that for these three drivers.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/platform/m2m-deinterlace.c

@@ -1033,6 +1033,7 @@ static int deinterlace_probe(struct platform_device *pdev)
 
 	*vfd = deinterlace_videodev;
 	vfd->lock = &pcdev->dev_mutex;
+	vfd->v4l2_dev = &pcdev->v4l2_dev;
 
 	ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
 	if (ret) {

drivers/media/platform/mem2mem_testdev.c

@@ -1051,6 +1051,7 @@ static int m2mtest_probe(struct platform_device *pdev)
 
 	*vfd = m2mtest_videodev;
 	vfd->lock = &dev->dev_mutex;
+	vfd->v4l2_dev = &dev->v4l2_dev;
 
 	ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
 	if (ret) {
@@ -1061,7 +1062,7 @@ static int m2mtest_probe(struct platform_device *pdev)
 	video_set_drvdata(vfd, dev);
 	snprintf(vfd->name, sizeof(vfd->name), "%s", m2mtest_videodev.name);
 	dev->vfd = vfd;
-	v4l2_info(&dev->v4l2_dev, MEM2MEM_TEST_MODULE_NAME
+	v4l2_info(&dev->v4l2_dev,
 			"Device registered as /dev/video%d\n", vfd->num);
 
 	setup_timer(&dev->timer, device_isr, (long)dev);

drivers/media/platform/mx2_emmaprp.c

@@ -937,6 +937,7 @@ static int emmaprp_probe(struct platform_device *pdev)
 
 	*vfd = emmaprp_videodev;
 	vfd->lock = &pcdev->dev_mutex;
+	vfd->v4l2_dev = &pcdev->v4l2_dev;
 
 	video_set_drvdata(vfd, pcdev);
 	snprintf(vfd->name, sizeof(vfd->name), "%s", emmaprp_videodev.name);