[PATCH] SourceLevelDebugPkg DebugUsb3: Fix GCC build failures

[Star Zeng <star.zeng@intel.com>]

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.

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 87fb0265489b..c577df7dea97 100644
--- a/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Common.c
+++ b/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Common.c
@@ -906,7 +906,6 @@ DebugPortWriteBuffer (
   USB3_DEBUG_PORT_HANDLE    *UsbDebugPortHandle;
   UINTN                     Sent;
   UINTN                     Total;
-  UINTN                     Index;
 
   if (NumberOfBytes == 0 || Buffer == NULL) {
     return 0;
@@ -934,7 +933,6 @@ DebugPortWriteBuffer (
   //
   DebugPortPollBuffer (UsbDebugPortHandle);
 
-  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