[media] Staging: dt3155v4l: set error code on failure

We should be returning -ENOMEM here instead of success.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/staging/media/dt3155v4l/dt3155v4l.c

@@ -906,8 +906,10 @@ dt3155_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (!pd)
 		return -ENOMEM;
 	pd->vdev = video_device_alloc();
-	if (!pd->vdev)
+	if (!pd->vdev) {
+		err = -ENOMEM;
 		goto err_video_device_alloc;
+	}
 	*pd->vdev = dt3155_vdev;
 	pci_set_drvdata(pdev, pd);    /* for use in dt3155_remove() */
 	video_set_drvdata(pd->vdev, pd);  /* for use in video_fops */