[media] media: davinci: vpfe: fix build error

recent patch with commit id 4f996594ceaf6c3f9bc42b40c40b0f7f87b79c86
which makes vidioc_s_crop const, was causing a following build error.
vpfe_capture.c: In function 'vpfe_s_crop':
vpfe_capture.c:1695: error: assignment of read-only location '*crop'
vpfe_capture.c:1706: warning: passing argument 1 of
'ccdc_dev->hw_ops.set_image_window' discards qualifiers from pointer target type
vpfe_capture.c:1706: note: expected 'struct v4l2_rect *' but argument is of
type 'const struct v4l2_rect *'
make[4]: *** [drivers/media/platform/davinci/vpfe_capture.o] Error 1

Signed-off-by: Lad, Prabhakar <prabhakar.lad@ti.com>
Signed-off-by: Manjunath Hadli <manjunath.hadli@ti.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/platform/davinci/vpfe_capture.c

@@ -1669,6 +1669,7 @@ static int vpfe_s_crop(struct file *file, void *priv,
 			     const struct v4l2_crop *crop)
 {
 	struct vpfe_device *vpfe_dev = video_drvdata(file);
+	struct v4l2_rect rect = crop->c;
 	int ret = 0;
 
 	v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_s_crop\n");
@@ -1684,7 +1685,7 @@ static int vpfe_s_crop(struct file *file, void *priv,
 	if (ret)
 		return ret;
 
-	if (crop->c.top < 0 || crop->c.left < 0) {
+	if (rect.top < 0 || rect.left < 0) {
 		v4l2_err(&vpfe_dev->v4l2_dev,
 			"doesn't support negative values for top & left\n");
 		ret = -EINVAL;
@@ -1692,26 +1693,26 @@ static int vpfe_s_crop(struct file *file, void *priv,
 	}
 
 	/* adjust the width to 16 pixel boundary */
-	crop->c.width = ((crop->c.width + 15) & ~0xf);
+	rect.width = ((rect.width + 15) & ~0xf);
 
 	/* make sure parameters are valid */
-	if ((crop->c.left + crop->c.width >
+	if ((rect.left + rect.width >
 		vpfe_dev->std_info.active_pixels) ||
-	    (crop->c.top + crop->c.height >
+	    (rect.top + rect.height >
 		vpfe_dev->std_info.active_lines)) {
 		v4l2_err(&vpfe_dev->v4l2_dev, "Error in S_CROP params\n");
 		ret = -EINVAL;
 		goto unlock_out;
 	}
-	ccdc_dev->hw_ops.set_image_window(&crop->c);
-	vpfe_dev->fmt.fmt.pix.width = crop->c.width;
-	vpfe_dev->fmt.fmt.pix.height = crop->c.height;
+	ccdc_dev->hw_ops.set_image_window(&rect);
+	vpfe_dev->fmt.fmt.pix.width = rect.width;
+	vpfe_dev->fmt.fmt.pix.height = rect.height;
 	vpfe_dev->fmt.fmt.pix.bytesperline =
 		ccdc_dev->hw_ops.get_line_length();
 	vpfe_dev->fmt.fmt.pix.sizeimage =
 		vpfe_dev->fmt.fmt.pix.bytesperline *
 		vpfe_dev->fmt.fmt.pix.height;
-	vpfe_dev->crop = crop->c;
+	vpfe_dev->crop = rect;
 unlock_out:
 	mutex_unlock(&vpfe_dev->lock);
 	return ret;