[clang] [NFC] Avoid potential null dereference. (PR #126872)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-format

Author: None (schittir)

<details>
<summary>Changes</summary>

Add a null check.

---
Full diff: https://github.com/llvm/llvm-project/pull/126872.diff


1 Files Affected:

- (modified) clang/lib/Format/UnwrappedLineFormatter.cpp (+1-1) 


``````````diff
diff --git a/clang/lib/Format/UnwrappedLineFormatter.cpp b/clang/lib/Format/UnwrappedLineFormatter.cpp
index 46545aa1f4c07..a5b30c85974c7 100644
--- a/clang/lib/Format/UnwrappedLineFormatter.cpp
+++ b/clang/lib/Format/UnwrappedLineFormatter.cpp
@@ -1596,7 +1596,7 @@ static auto computeNewlines(const AnnotatedLine &Line,
     if (Line.startsWith(TT_NamespaceRBrace)) {
       if (Style.WrapNamespaceBodyWithEmptyLines == FormatStyle::WNBWELS_Never)
         Newlines = 1;
-      else if (!PreviousLine->startsWith(TT_NamespaceRBrace))
+      else if (PreviousLine && !PreviousLine->startsWith(TT_NamespaceRBrace))
         Newlines = std::max(Newlines, 2u);
     }
   }

``````````

</details>


https://github.com/llvm/llvm-project/pull/126872