media: soc_camera: fix compiler warning

In function 'strncpy',
    inlined from 'soc_camera_platform_probe' at drivers/media/platform/soc_camera/soc_camera_platform.c:162:2:
include/linux/string.h:246:9: warning: '__builtin_strncpy' specified bound 32 equals destination size [-Wstringop-truncation]
  return __builtin_strncpy(p, q, size);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/soc_camera/soc_camera_platform.c

@@ -159,7 +159,8 @@ static int soc_camera_platform_probe(struct platform_device *pdev)
 
 	v4l2_subdev_init(&priv->subdev, &platform_subdev_ops);
 	v4l2_set_subdevdata(&priv->subdev, p);
-	strncpy(priv->subdev.name, dev_name(&pdev->dev), V4L2_SUBDEV_NAME_SIZE);
+	strlcpy(priv->subdev.name, dev_name(&pdev->dev),
+		sizeof(priv->subdev.name));
 
 	return v4l2_device_register_subdev(&ici->v4l2_dev, &priv->subdev);
 }