[media] s5p-fimc: Fix error in the capture subdev deinitialization

Make sure the subdev pointer is cleared when the subdev object
has been freed.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/s5p-fimc/fimc-capture.c b/drivers/media/video/s5p-fimc/fimc-capture.c
index c8d91b0..382dacd 100644
--- a/drivers/media/video/s5p-fimc/fimc-capture.c
+++ b/drivers/media/video/s5p-fimc/fimc-capture.c
@@ -1375,7 +1375,7 @@
 	media_entity_cleanup(&sd->entity);
 	v4l2_device_unregister_subdev(sd);
 	kfree(sd);
-	sd = NULL;
+	fimc->vid_cap.subdev = NULL;
 }
 
 /* Set default format at the sensor and host interface */