drm: Drop plane argument from __drm_atomic_helper_plane_destroy_state

It's unused, and really this helper should only look at the state
structure and nothing else.

v2: Fix commit message (Laurent).

v3: Rebase onto mtk driver merge.

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Eric Anholt <eric@anholt.net>
Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Mark Yao <mark.yao@rock-chips.com>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1462804451-15318-2-git-send-email-daniel.vetter@ffwll.ch
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 055d547..c6282b4 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -2636,7 +2636,7 @@
 void drm_atomic_helper_plane_reset(struct drm_plane *plane)
 {
 	if (plane->state)
-		__drm_atomic_helper_plane_destroy_state(plane, plane->state);
+		__drm_atomic_helper_plane_destroy_state(plane->state);
 
 	kfree(plane->state);
 	plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL);
@@ -2691,15 +2691,13 @@
 
 /**
  * __drm_atomic_helper_plane_destroy_state - release plane state
- * @plane: plane object
  * @state: plane state object to release
  *
  * Releases all resources stored in the plane state without actually freeing
  * the memory of the plane state. This is useful for drivers that subclass the
  * plane state.
  */
-void __drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
-					     struct drm_plane_state *state)
+void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state)
 {
 	if (state->fb)
 		drm_framebuffer_unreference(state->fb);
@@ -2717,7 +2715,7 @@
 void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
 					   struct drm_plane_state *state)
 {
-	__drm_atomic_helper_plane_destroy_state(plane, state);
+	__drm_atomic_helper_plane_destroy_state(state);
 	kfree(state);
 }
 EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);