drm/msm/disp/dpu1/dpu_core_perf: Remove set but unused variable 'dpu_cstate'

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c: In function ‘_dpu_core_perf_calc_crtc’:
 drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c:113:25: warning: variable ‘dpu_cstate’ set but not used [-Wunused-but-set-variable]

Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Kalyan Thota <kalyan_t@codeaurora.org>
Cc: linux-arm-msm@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c

@@ -110,14 +110,11 @@ static void _dpu_core_perf_calc_crtc(struct dpu_kms *kms,
 		struct drm_crtc_state *state,
 		struct dpu_core_perf_params *perf)
 {
-	struct dpu_crtc_state *dpu_cstate;
-
 	if (!kms || !kms->catalog || !crtc || !state || !perf) {
 		DPU_ERROR("invalid parameters\n");
 		return;
 	}
 
-	dpu_cstate = to_dpu_crtc_state(state);
 	memset(perf, 0, sizeof(struct dpu_core_perf_params));
 
 	if (kms->perf.perf_tune.mode == DPU_PERF_MODE_MINIMUM) {