Use correct stack when using preallocated processor structures

xtoskrnl/po/idle.c

@@ -33,7 +33,7 @@ PoInitializeProcessorControlBlock(IN OUT PKPROCESSOR_CONTROL_BLOCK Prcb)
 
     /* Initialize DPC and Timer */
     KeInitializeDpc(&Prcb->PowerState.PerfDpc, PopPerfIdleDpc, Prcb);
-    KeSetTargetProcessorDpc(&Prcb->PowerState.PerfDpc, Prcb->Number);
+    KeSetTargetProcessorDpc(&Prcb->PowerState.PerfDpc, Prcb->CpuNumber);
     KeInitializeTimer(&Prcb->PowerState.PerfTimer, SynchronizationTimer);
 }