GCC build failure: 'RealCommSize' may be used uninitialized

Cc: Jiewen Yao <jiewen....@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.z...@intel.com>
---
 MdeModulePkg/Application/VariableInfo/VariableInfo.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/MdeModulePkg/Application/VariableInfo/VariableInfo.c 
b/MdeModulePkg/Application/VariableInfo/VariableInfo.c
index df91c1451c19..a88b7f1ec42c 100644
--- a/MdeModulePkg/Application/VariableInfo/VariableInfo.c
+++ b/MdeModulePkg/Application/VariableInfo/VariableInfo.c
@@ -104,6 +104,7 @@ PrintInfoFromSmm (
   }
 
   CommBuffer = NULL;
+  RealCommSize = 0;
   Status = EfiGetSystemConfigurationTable (
              &gEdkiiPiSmmCommunicationRegionTableGuid,
              (VOID **) &PiSmmCommunicationRegionTable
-- 
2.7.0.windows.1

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