[clang] Guard against nullptr (PR #94084)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: None (Sterling-Augustine)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/94084.diff


1 Files Affected:

- (modified) clang/lib/AST/QualTypeNames.cpp (+3-2) 


``````````diff
diff --git a/clang/lib/AST/QualTypeNames.cpp b/clang/lib/AST/QualTypeNames.cpp
index 066377423df76..18ac4b1eb57e7 100644
--- a/clang/lib/AST/QualTypeNames.cpp
+++ b/clang/lib/AST/QualTypeNames.cpp
@@ -65,8 +65,9 @@ static bool getFullyQualifiedTemplateName(const ASTContext &Ctx,
   assert(ArgTDecl != nullptr);
   QualifiedTemplateName *QTName = TName.getAsQualifiedTemplateName();
 
-  if (QTName && !QTName->hasTemplateKeyword()) {
-    NNS = QTName->getQualifier();
+  if (QTName &&
+      !QTName->hasTemplateKeyword() &&
+      (NNS = QTName->getQualifier())) {
     NestedNameSpecifier *QNNS = getFullyQualifiedNestedNameSpecifier(
         Ctx, NNS, WithGlobalNsPrefix);
     if (QNNS != NNS) {

``````````

</details>


https://github.com/llvm/llvm-project/pull/94084