[clang-tools-extra] [Clangd] [NFC] Fix dereference of null value (PR #159566)

[Yanzuo Liu via cfe-commits]

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@@ -145,8 +145,11 @@ std::string getQualification(ASTContext &Context,
   for (const auto *CurD : llvm::reverse(Parents)) {
     if (auto *TD = llvm::dyn_cast<TagDecl>(CurD)) {
       QualType T;
-      if (const auto *RD = dyn_cast<CXXRecordDecl>(TD);
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zwuis wrote:

I think changing `dyn_cast` to `cast` is better unless a test case causing crash is found.

https://github.com/llvm/llvm-project/pull/159566