[media] cx25821-video: remove maxw from cx25821_vidioc_try_fmt_vid_cap

After cx25821-video cleanup, this var is not used anymore:

drivers/media/pci/cx25821/cx25821-video.c: In function 'cx25821_vidioc_try_fmt_vid_cap':
drivers/media/pci/cx25821/cx25821-video.c:591:15: warning: variable 'maxw' set but not used [-Wunused-but-set-variable]

as the code now checks the max width as the default case for the
range check.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/pci/cx25821/cx25821-video.c

@@ -588,13 +588,12 @@ static int cx25821_vidioc_try_fmt_vid_cap(struct file *file, void *priv,
 	struct cx25821_dev *dev = chan->dev;
 	const struct cx25821_fmt *fmt;
 	enum v4l2_field field = f->fmt.pix.field;
-	unsigned int maxw, maxh;
+	unsigned int maxh;
 	unsigned w;
 
 	fmt = cx25821_format_by_fourcc(f->fmt.pix.pixelformat);
 	if (NULL == fmt)
 		return -EINVAL;
-	maxw = 720;
 	maxh = (dev->tvnorm & V4L2_STD_625_50) ? 576 : 480;
 
 	w = f->fmt.pix.width;