Fixed memory corruption bug by explicitly initializing the pointer to null.

src/CppParser/Parser.cpp

@@ -1977,7 +1977,7 @@ PreprocessedEntity* Parser::WalkPreprocessedEntity(
 
     auto& P = C->getPreprocessor();
 
-    PreprocessedEntity* Entity;
+    PreprocessedEntity* Entity = 0;
 
     switch(PPEntity->getKind())
     {

src/Parser/Parser.cpp

@@ -2000,7 +2000,7 @@ CppSharp::AST::PreprocessedEntity^ Parser::WalkPreprocessedEntity(
 
     auto& P = C->getPreprocessor();
 
-    CppSharp::AST::PreprocessedEntity^ Entity;
+    CppSharp::AST::PreprocessedEntity^ Entity = nullptr;
 
     switch(PPEntity->getKind())
     {