[COMPBATT] Remove the useless WaitFlag field in the code which is never used

drivers/bus/acpi/compbatt/comppnp.c

@@ -165,7 +165,6 @@ CompBattAddNewBattery(IN PUNICODE_STRING BatteryName,
                     /* Set IRP data */
                     IoSetNextIrpStackLocation(Irp);
                     Irp->IoStatus.Status = STATUS_DEVICE_NOT_CONNECTED;
-                    BatteryData->WaitFlag = 0;
 
                     /* Insert this battery in the list */
                     ExAcquireFastMutex(&DeviceExtension->Lock);