Core code already clears reserved fields of struct v4l2_pix_format_mplane,
check commit 
4e1e0eb0e074 ("media: v4l2-ioctl: Zero v4l2_plane_pix_format
reserved fields").
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
 
 
        pixm->pixelformat = fmt->fourcc;
 
-       memset(pixm->plane_fmt[0].reserved, 0,
-              sizeof(pixm->plane_fmt[0].reserved));
-
        return 0;
 }