drm/komeda: Fix warning -Wunused-but-set-variable

Fixed two -Wunused-but-set-variable warnings:

/arm/linux/display/aosp-4.14-drm-next/drivers/gpu/drm/arm/display/komeda/komeda_kms.c: In function ‘komeda_crtc_normalize_zpos’:
/arm/linux/display/aosp-4.14-drm-next/drivers/gpu/drm/arm/display/komeda/komeda_kms.c:150:26: warning: variable ‘fb’ set but not used [-Wunused-but-set-variable]
struct drm_framebuffer *fb;
^~
/arm/linux/display/aosp-4.14-drm-next/drivers/gpu/drm/arm/display/komeda/komeda_kms.c: In function ‘komeda_kms_check’:
/arm/linux/display/aosp-4.14-drm-next/drivers/gpu/drm/arm/display/komeda/komeda_kms.c:209:25: warning: variable ‘old_crtc_st’ set but not used [-Wunused-but-set-variable]
struct drm_crtc_state *old_crtc_st, *new_crtc_st;
^~~~~~~~~~~

Signed-off-by: james qian wang (Arm Technology China) <[e-mail]>
Reviewed-by: Ayan Kumar Halder <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/arm/display/komeda/komeda_kms.c

···
 	struct komeda_crtc_state *kcrtc_st = to_kcrtc_st(crtc_st);
 	struct komeda_plane_state *kplane_st;
 	struct drm_plane_state *plane_st;
-	struct drm_framebuffer *fb;
 	struct drm_plane *plane;
 	struct list_head zorder_list;
 	int order = 0, err;
···
 
 	list_for_each_entry(kplane_st, &zorder_list, zlist_node) {
 		plane_st = &kplane_st->base;
-		fb = plane_st->fb;
 		plane = plane_st->plane;
 
 		plane_st->normalized_zpos = order++;
···
 			    struct drm_atomic_state *state)
 {
 	struct drm_crtc *crtc;
-	struct drm_crtc_state *old_crtc_st, *new_crtc_st;
+	struct drm_crtc_state *new_crtc_st;
 	int i, err;
 
 	err = drm_atomic_helper_check_modeset(dev, state);
···
 	 * so need to add all affected_planes (even unchanged) to
 	 * drm_atomic_state.
 	 */
-	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_st, new_crtc_st, i) {
+	for_each_new_crtc_in_state(state, crtc, new_crtc_st, i) {
 		err = drm_atomic_add_affected_planes(state, crtc);
 		if (err)
 			return err;