[clang] [clang-format] Harden star and amp annotation (PR #212856)

[via cfe-commits]

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@@ -2674,15 +2675,18 @@ bool UnwrappedLineParser::parseParens(TokenType StarAndAmpTokenType,
   bool SeenComma = false;
   bool SeenEqual = false;
   bool MightBeFoldExpr = false;
+  auto ExcessLess = 0;
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owenca wrote:

```suggestion
  unsigned ExcessLess = 0;
```

https://github.com/llvm/llvm-project/pull/212856