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

[via cfe-commits]

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

Add a null check.

>From 5a25d2a34813d7b37a0a26cd883c6a7ccd4574a8 Mon Sep 17 00:00:00 2001
From: Sindhu Chittireddy <sindhu.chittireddy at intel.com>
Date: Wed, 12 Feb 2025 00:05:33 -0800
Subject: [PATCH] [NFC] Avoid potential null dereference.

---
 clang/lib/Format/UnwrappedLineFormatter.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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);
     }
   }