return EFI_DEVICE_ERROR if the Status value is not EFI_SUCCESS.

it's because BlockIo.Reset() only has two possible values: EFI_SUCCESS and EFI_DEVICE_ERROR according to UEFI2.3 spec

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10956 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Bus/Ata/AtaBusDxe/AtaBus.c

@@ -4,7 +4,7 @@
   This file implements protocol interfaces: Driver Binding protocol,
   Block IO protocol and DiskInfo protocol.
     
-  Copyright (c) 2009, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
@@ -773,6 +773,10 @@ AtaBlockIoReset (
 
   Status = ResetAtaDevice (AtaDevice);  
 
+  if (EFI_ERROR (Status)) {
+    Status = EFI_DEVICE_ERROR;
+  }
+
   gBS->RestoreTPL (OldTpl);
   return Status;
 }