[PATCH 3/3] MdePkg/UefiDebugLibDebugPortProtocol: Change the global variable name

["Gao, Zhichao" <zhichao.gao@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1740

The DebugLib instances of DebugPortProtocol use a global
variable "mExitBootServicesEvent" which is in conflict with
the same variable in StatusCodeHandlerRuntimeDxe.inf.
That would cause a build error through GCC5. So change the
name to the "mDebugLibExitBootServicesEvent".

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Dandan Bi <dandan.bi@intel.com>
Signed-off-by: Zhichao Gao <zhichao.gao@intel.com>
---
 .../UefiDebugLibDebugPortProtocol/DebugLibConstructor.c       | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/MdePkg/Library/UefiDebugLibDebugPortProtocol/DebugLibConstructor.c b/MdePkg/Library/UefiDebugLibDebugPortProtocol/DebugLibConstructor.c
index ed2cb70c21..f4c4a7d1e7 100644
--- a/MdePkg/Library/UefiDebugLibDebugPortProtocol/DebugLibConstructor.c
+++ b/MdePkg/Library/UefiDebugLibDebugPortProtocol/DebugLibConstructor.c
@@ -17,7 +17,7 @@
 //
 BOOLEAN     mPostEBS = FALSE;
 
-EFI_EVENT   mExitBootServicesEvent;
+EFI_EVENT   mDebugLibExitBootServicesEvent;
 
 //
 // Pointer to SystemTable
@@ -70,7 +70,7 @@ DxeDebugLibConstructor(
               ExitBootServicesCallback,
               NULL,
               &gEfiEventExitBootServicesGuid,
-              &mExitBootServicesEvent
+              &mDebugLibExitBootServicesEvent
               );
 
   return EFI_SUCCESS;
-- 
2.21.0.windows.1