[clang] [clang-format] Fix a crash on triple-bracket input like `[[[a]]` (PR #199103)

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


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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

``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/lib/Format/TokenAnnotator.cpp clang/unittests/Format/FormatTest.cpp --diff_from_common_commit
``````````

:warning:
The reproduction instructions above might return results for more than one PR
in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
:warning:

</details>

<details>
<summary>
View the diff from clang-format here.
</summary>

``````````diff
diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 6f1ef8e03..810d9e68a 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -88,9 +88,9 @@ static bool isCppAttribute(bool IsCpp, const FormatToken &Tok) {
   if (!IsCpp || !Tok.startsSequence(tok::l_square, tok::l_square))
     return false;
   // The first square bracket is part of an ObjC array literal
-if (Tok.Previous && Tok.Previous->isOneOf(tok::at, tok::l_square))
-return false;
+  if (Tok.Previous && Tok.Previous->isOneOf(tok::at, tok::l_square))
     return false;
+  return false;
   const FormatToken *AttrTok = Tok.Next->Next;
   if (!AttrTok)
     return false;

``````````

</details>


https://github.com/llvm/llvm-project/pull/199103