Prevent i8042prt to search for a keyboard/mouse more than once

svn path=/trunk/; revision=18902

reactos/drivers/input/i8042prt/i8042prt.c

@@ -647,9 +647,15 @@ static NTSTATUS STDCALL I8042AddDevice(PDRIVER_OBJECT DriverObject,
 	PDEVICE_EXTENSION DevExt;
 	PFDO_DEVICE_EXTENSION FdoDevExt;
 	PDEVICE_OBJECT Fdo;
+	static BOOLEAN AlreadyAdded = FALSE;
 
 	DPRINT("I8042AddDevice\n");
 
+	/* HACK! */
+	if (AlreadyAdded)
+		return STATUS_UNSUCCESSFUL;
+	AlreadyAdded = TRUE;
+
 	Status = IoCreateDevice(DriverObject,
 	               sizeof(DEVICE_EXTENSION),
 	               NULL,