sys: FspIopCompleteIrpEx:

- only update statistics if we actually have a reference to the DeviceObject

src/sys/iop.c

@@ -287,6 +287,9 @@ VOID FspIopCompleteIrpEx(PIRP Irp, NTSTATUS Result, BOOLEAN DeviceDereference)
      * We update the Create statistics here to avoid doing it in multiple places.
      */
     if (IRP_MJ_CREATE == IrpSp->MajorFunction)
+    {
+        /* only update statistics if we actually have a reference to the DeviceObject */
+        if (DeviceDereference)
         {
             FSP_DEVICE_EXTENSION *DeviceExtension = FspDeviceExtension(DeviceObject);
 
@@ -302,6 +305,7 @@ VOID FspIopCompleteIrpEx(PIRP Irp, NTSTATUS Result, BOOLEAN DeviceDereference)
                     FspStatisticsInc(Statistics, Specific.FailedCreates);
             }
         }
+    }
     else
     /*
      * HACK: