drm/tegra: dc: Remove unused variables

Remove unused variables from tegra_crtc_update_memory_bandwidth().

Fixes: 04d5d5df ("drm/tegra: dc: Support memory bandwidth management")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/dc.c

@@ -1845,7 +1845,6 @@ tegra_crtc_update_memory_bandwidth(struct drm_crtc *crtc,
 				   bool prepare_bandwidth_transition)
 {
 	const struct tegra_plane_state *old_tegra_state, *new_tegra_state;
-	const struct tegra_dc_state *old_dc_state, *new_dc_state;
 	u32 i, new_avg_bw, old_avg_bw, new_peak_bw, old_peak_bw;
 	const struct drm_plane_state *old_plane_state;
 	const struct drm_crtc_state *old_crtc_state;
@@ -1858,8 +1857,6 @@ tegra_crtc_update_memory_bandwidth(struct drm_crtc *crtc,
 		return;
 
 	old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);
-	old_dc_state = to_const_dc_state(old_crtc_state);
-	new_dc_state = to_const_dc_state(crtc->state);
 
 	if (!crtc->state->active) {
 		if (!old_crtc_state->active)

drivers/gpu/drm/tegra/dc.h

@@ -35,12 +35,6 @@ static inline struct tegra_dc_state *to_dc_state(struct drm_crtc_state *state)
 	return NULL;
 }
 
-static inline const struct tegra_dc_state *
-to_const_dc_state(const struct drm_crtc_state *state)
-{
-	return to_dc_state((struct drm_crtc_state *)state);
-}
-
 struct tegra_dc_stats {
 	unsigned long frames;
 	unsigned long vblank;