media: bcm2835-unicam: fix format on s_selection

the selection API may update the subdev's format. In
order to ensure that the `GET_FMT` ioctl calls remain
in sync with the subdev's state, a call to reset_format
is done at the end of the `s_selection` call.

Signed-off-by: Vinay Varma <varmavinaym@gmail.com>

drivers/media/platform/bcm2835/bcm2835-unicam.c

@@ -1570,6 +1570,7 @@ static int unicam_g_edid(struct file *file, void *priv, struct v4l2_edid *edid)
 static int unicam_s_selection(struct file *file, void *priv,
 			      struct v4l2_selection *sel)
 {
+	int ret;
 	struct unicam_node *node = video_drvdata(file);
 	struct unicam_device *dev = node->dev;
 	struct v4l2_subdev_selection sdsel = {
@@ -1582,8 +1583,12 @@ static int unicam_s_selection(struct file *file, void *priv,
 	if (sel->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 		return -EINVAL;
 
-	return v4l2_subdev_call_state_active(dev->sensor, pad, set_selection,
-					     &sdsel);
+	ret = v4l2_subdev_call_state_active(dev->sensor, pad, set_selection,
+					    &sdsel);
+	if (ret < 0)
+		return ret;
+	node->v_fmt.fmt.pix.bytesperline = 0;
+	return unicam_reset_format(node);
 }
 
 static int unicam_g_selection(struct file *file, void *priv,