[clang] [-Wunsafe-buffer-usage] Fix AST matcher of UUCAddAssignGadget (PR #79392)

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https://github.com/jkorous-apple created https://github.com/llvm/llvm-project/pull/79392

We are not interested in nonpointers being added to.

>From afda86d399dbb277d2fa3b0134a9724c206919fb Mon Sep 17 00:00:00 2001
From: Jan Korous <jkorous at apple.com>
Date: Wed, 24 Jan 2024 15:02:55 -0800
Subject: [PATCH] [-Wunsafe-buffer-usage] Fix AST matcher of UUCAddAssignGadget

We are not interested in nonpointers being added to.
---
 clang/lib/Analysis/UnsafeBufferUsage.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Analysis/UnsafeBufferUsage.cpp b/clang/lib/Analysis/UnsafeBufferUsage.cpp
index 7df706beb22662c..fd7a76d511862ec 100644
--- a/clang/lib/Analysis/UnsafeBufferUsage.cpp
+++ b/clang/lib/Analysis/UnsafeBufferUsage.cpp
@@ -1081,11 +1081,16 @@ class UUCAddAssignGadget : public FixableGadget {
   }
 
   static Matcher matcher() {
+// clang-format off
     return stmt(isInUnspecifiedUntypedContext(expr(ignoringImpCasts(
         binaryOperator(hasOperatorName("+="),
-                       hasLHS(declRefExpr(toSupportedVariable())),
+                       hasLHS(
+                        declRefExpr(
+                          hasPointerType(),
+                          toSupportedVariable())),
                        hasRHS(expr().bind(OffsetTag)))
             .bind(UUCAddAssignTag)))));
+// clang-format on
   }
 
   virtual std::optional<FixItList> getFixits(const Strategy &S) const override;