media: saa7146: Replace saa7146_ext_vv.vbi_fops with write function

The vbi_fops stored in struct saa7146_ext_vv is a full
v4l2_file_operations, but only its .write field is used. Replace it with
a single vbi_write function pointer to save memory.

Signed-off-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/common/saa7146/saa7146_fops.c

···
 	struct saa7146_dev *dev = video_drvdata(file);
 	int ret;
 
-	if (vdev->vfl_type != VFL_TYPE_VBI || !dev->ext_vv_data->vbi_fops.write)
+	if (vdev->vfl_type != VFL_TYPE_VBI || !dev->ext_vv_data->vbi_write)
 		return -EINVAL;
 	if (mutex_lock_interruptible(vdev->lock))
 		return -ERESTARTSYS;
-	ret = dev->ext_vv_data->vbi_fops.write(file, data, count, ppos);
+	ret = dev->ext_vv_data->vbi_write(file, data, count, ppos);
 	mutex_unlock(vdev->lock);
 	return ret;
 }

drivers/staging/media/av7110/av7110_v4l.c

···
 	.num_stds	= ARRAY_SIZE(standard),
 	.std_callback	= &std_callback,
 
-	.vbi_fops.write	= av7110_vbi_write,
+	.vbi_write	= av7110_vbi_write,
 };
 
 static struct saa7146_ext_vv av7110_vv_data_c = {
···
 	.num_stds	= ARRAY_SIZE(standard),
 	.std_callback	= &std_callback,
 
-	.vbi_fops.write	= av7110_vbi_write,
+	.vbi_write	= av7110_vbi_write,
 };
 

include/media/drv-intf/saa7146_vv.h

···
 	/* pointer to the saa7146 core ops */
 	const struct v4l2_ioctl_ops *core_ops;
 
-	struct v4l2_file_operations vbi_fops;
+	ssize_t (*vbi_write)(struct file *file, const char __user *data,
+			     size_t count, loff_t *ppos);
 };
 
 struct saa7146_use_ops  {