drm/msm/dpu: bail from _dpu_core_perf_crtc_update_bus if there are no ICC paths

Skip bandwidth aggregation and return early if there are no interconnect
paths defined for the DPU device.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/550195/
Link: https://lore.kernel.org/r/20230730010102.350713-3-dmitry.baryshkov@linaro.org

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

@@ -217,6 +217,9 @@ static int _dpu_core_perf_crtc_update_bus(struct dpu_kms *kms,
 	int i, ret = 0;
 	u64 avg_bw;
 
+	if (!kms->num_paths)
+		return 0;
+
 	drm_for_each_crtc(tmp_crtc, crtc->dev) {
 		if (tmp_crtc->enabled &&
 			curr_client_type ==
@@ -234,9 +237,6 @@ static int _dpu_core_perf_crtc_update_bus(struct dpu_kms *kms,
 		}
 	}
 
-	if (!kms->num_paths)
-		return 0;
-
 	avg_bw = perf.bw_ctl;
 	do_div(avg_bw, (kms->num_paths * 1000)); /*Bps_to_icc*/