Fix GCC build failures below.
variable 'EvtTrb' set but not used [-Werror=unused-but-set-variable]
variable 'Index' set but not used [-Werror=unused-but-set-variable]

The build failure could only be caught with -D SOURCE_DEBUG_USE_USB3
build flag.

ad6040ec9b5bbc462762331f9738b8e42c0b9c80 needs to be also reverted
when reverting IOMMU support patches, otherwise there will be conflict.
This patch is to re-do ad6040ec9b5bbc462762331f9738b8e42c0b9c80.

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
---
 .../DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Common.c       | 2 --
 .../DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Transfer.c     | 4 +---
 2 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Common.c b/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Common.c
index 49bad6b5864d..3b0f81cf88fd 100644
--- a/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Common.c
+++ b/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Common.c
@@ -852,7 +852,6 @@ DebugPortWriteBuffer (
   UINTN                     Sent;
   UINTN                     Total;
   EFI_PHYSICAL_ADDRESS      XhciMmioBase;
-  UINTN                     Index;
 
   if (NumberOfBytes == 0 || Buffer == NULL) {
     return 0;
@@ -895,7 +894,6 @@ DebugPortWriteBuffer (
   //
   DebugPortPollBuffer (Handle);
 
-  Index = 0;
   while ((Total < NumberOfBytes)) {
     if (NumberOfBytes - Total > USB3_DEBUG_PORT_WRITE_MAX_PACKET_SIZE) {
       Sent = USB3_DEBUG_PORT_WRITE_MAX_PACKET_SIZE;
diff --git a/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Transfer.c b/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Transfer.c
index dbff49362407..1b6645bd1c6d 100644
--- a/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Transfer.c
+++ b/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Transfer.c
@@ -1,7 +1,7 @@
 /** @file
   Debug Port Library implementation based on usb3 debug port.
 
-  Copyright (c) 2014 - 2015, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2014 - 2018, 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
@@ -145,11 +145,9 @@ XhcCheckNewEvent (
   )
 {
   EFI_STATUS          Status;
-  TRB_TEMPLATE        *EvtTrb;
 
   ASSERT (EvtRing != NULL);
 
-  EvtTrb     = (TRB_TEMPLATE *)(UINTN) EvtRing->EventRingDequeue;
   *NewEvtTrb = (TRB_TEMPLATE *)(UINTN) EvtRing->EventRingDequeue;
 
   if (EvtRing->EventRingDequeue == EvtRing->EventRingEnqueue) {
-- 
2.7.0.windows.1

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