If the ioctl returned -ENOTTY, then don't bother copying
back the result as there is no point.
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Acked-by: NSakari Ailus <sakari.ailus@linux.intel.com>
Cc: <stable@vger.kernel.org>      # for v4.15 and up
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>