drm/msm/dpu: drop unused variable from dpu_kms_mdp_snapshot()

Follow up the merge of address fields and drop the variable that became
unused after the commit 9403f9a4 ("drm/msm/dpu: merge base_off with
blk_off in struct dpu_hw_blk_reg_map").

Fixes: 9403f9a4 ("drm/msm/dpu: merge base_off with blk_off in struct dpu_hw_blk_reg_map")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/498736/
Link: https://lore.kernel.org/r/20220822172204.281045-1-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

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

@@ -897,12 +897,10 @@ static void dpu_kms_mdp_snapshot(struct msm_disp_state *disp_state, struct msm_k
 	int i;
 	struct dpu_kms *dpu_kms;
 	const struct dpu_mdss_cfg *cat;
-	struct dpu_hw_mdp *top;
 
 	dpu_kms = to_dpu_kms(kms);
 
 	cat = dpu_kms->catalog;
-	top = dpu_kms->hw_mdp;
 
 	pm_runtime_get_sync(&dpu_kms->pdev->dev);