drm/exynos: remove unnecessary code.

plane->fb will be set to new fb after update_plane callback is called
by drm_mode_set_plane()

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
diff --git a/drivers/gpu/drm/exynos/exynos_drm_plane.c b/drivers/gpu/drm/exynos/exynos_drm_plane.c
index 60b877a..862ca1e 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_plane.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_plane.c
@@ -204,7 +204,6 @@
 		return ret;
 
 	plane->crtc = crtc;
-	plane->fb = crtc->fb;
 
 	exynos_plane_commit(plane);
 	exynos_plane_dpms(plane, DRM_MODE_DPMS_ON);