[media] bdisp: remove unused var

Fix the following warning:

drivers/media/platform/sti/bdisp/bdisp-v4l2.c: In function 'bdisp_register_device':
drivers/media/platform/sti/bdisp/bdisp-v4l2.c:1024:26: warning: variable 'pdev' set but not used [-Wunused-but-set-variable]
  struct platform_device *pdev;
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/sti/bdisp/bdisp-v4l2.c

@@ -1021,14 +1021,11 @@ static const struct v4l2_ioctl_ops bdisp_ioctl_ops = {
 
 static int bdisp_register_device(struct bdisp_dev *bdisp)
 {
-	struct platform_device *pdev;
 	int ret;
 
 	if (!bdisp)
 		return -ENODEV;
 
-	pdev = bdisp->pdev;
-
 	bdisp->vdev.fops        = &bdisp_fops;
 	bdisp->vdev.ioctl_ops   = &bdisp_ioctl_ops;
 	bdisp->vdev.release     = video_device_release_empty;