[clang] Fix a crash in clang::isGetterOfRefCounted by checking nullptr in tryToFindPtrOrigin (PR #80768)

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github-actions[bot] wrote:

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


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

<details>
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You can test this locally with the following command:
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``````````bash
git-clang-format --diff 6ce03ff3fef8fb6fa9afe8eb22c6d98bced26d48 
4e10436ddd55f1b1bed2bb99856e1101b9462117 -- 
clang/test/Analysis/Checkers/WebKit/member-function-pointer-crash.cpp 
clang/lib/StaticAnalyzer/Checkers/WebKit/ASTUtils.cpp
``````````

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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/StaticAnalyzer/Checkers/WebKit/ASTUtils.cpp 
b/clang/lib/StaticAnalyzer/Checkers/WebKit/ASTUtils.cpp
index 728772ed91..4526fac647 100644
--- a/clang/lib/StaticAnalyzer/Checkers/WebKit/ASTUtils.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/WebKit/ASTUtils.cpp
@@ -35,7 +35,8 @@ tryToFindPtrOrigin(const Expr *E, bool 
StopAtFirstRefCountedObj) {
     if (auto *call = dyn_cast<CallExpr>(E)) {
       if (auto *memberCall = dyn_cast<CXXMemberCallExpr>(call)) {
         if (auto *decl = memberCall->getMethodDecl()) {
-          std::optional<bool> IsGetterOfRefCt = 
isGetterOfRefCounted(memberCall->getMethodDecl());
+          std::optional<bool> IsGetterOfRefCt =
+              isGetterOfRefCounted(memberCall->getMethodDecl());
           if (IsGetterOfRefCt && *IsGetterOfRefCt) {
             E = memberCall->getImplicitObjectArgument();
             if (StopAtFirstRefCountedObj) {

``````````

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https://github.com/llvm/llvm-project/pull/80768
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