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

[Matheus Izvekov via cfe-commits]

================
@@ -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);
-          ClassTemplateDecl *CTD = RD->getDescribedClassTemplate()) {
+      const auto *RD = dyn_cast<CXXRecordDecl>(TD);
+      ClassTemplateDecl *CTD = nullptr;
+      if (RD)
+        CTD = RD->getDescribedClassTemplate();
+      if (RD && CTD) {
----------------
mizvekov wrote:

```suggestion
      if (const auto *RD = dyn_cast<CXXRecordDecl>(TD);
          ClassTemplateDecl *CTD = RD ? RD->getDescribedClassTemplate() : 
nullptr) {
```

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