media: s2255drv: remove redundant assignment to variable field

The variable 'field' is being assigned a value this is never read,
it is being updated in all the following if/else combinations. The
assignment is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/usb/s2255/s2255drv.c

@@ -767,8 +767,6 @@ static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
 	if (fmt == NULL)
 		return -EINVAL;
 
-	field = f->fmt.pix.field;
-
 	dprintk(vc->dev, 50, "%s NTSC: %d suggested width: %d, height: %d\n",
 		__func__, is_ntsc, f->fmt.pix.width, f->fmt.pix.height);
 	if (is_ntsc) {