[clang] [clang] Fix possible nullptr deref in BuildCXXNestedNameSpecifier (PR #166995)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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<details>
<summary>
You can test this locally with the following command:
</summary>

``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/test/Sema/PR166843.cpp clang/lib/Sema/SemaCXXScopeSpec.cpp --diff_from_common_commit
``````````

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<details>
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaCXXScopeSpec.cpp b/clang/lib/Sema/SemaCXXScopeSpec.cpp
index 81ff2ef69..926511afe 100644
--- a/clang/lib/Sema/SemaCXXScopeSpec.cpp
+++ b/clang/lib/Sema/SemaCXXScopeSpec.cpp
@@ -780,7 +780,7 @@ bool Sema::BuildCXXNestedNameSpecifier(Scope *S, NestedNameSpecInfo &IdInfo,
 
   if (!Found.empty()) {
     const auto *ND = Found.getAsSingle<NamedDecl>();
-    if(!ND)
+    if (!ND)
       return true;
     if (::ExtendNestedNameSpecifier(*this, SS, ND, IdInfo.IdentifierLoc,
                                     IdInfo.CCLoc)) {

``````````

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https://github.com/llvm/llvm-project/pull/166995