[clang] [clang][tools] Handle weak (and duplicate) symbols in clang-extdef-mapping (PR #222010)

[Balázs Kéri via cfe-commits]

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@@ -190,12 +200,15 @@ static int HandleFiles(ArrayRef<std::string> SourceFiles,
     }
   }
 
+  int Ret = 0;
   if (!SourcesToBeParsed.empty()) {
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balazske wrote:

It is not needed.

https://github.com/llvm/llvm-project/pull/222010