[clang] [clang]Remove unused variable (PR #211983)

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


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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/lib/StaticAnalyzer/Checkers/RetainCountChecker/RetainCountDiagnostics.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/StaticAnalyzer/Checkers/RetainCountChecker/RetainCountDiagnostics.cpp b/clang/lib/StaticAnalyzer/Checkers/RetainCountChecker/RetainCountDiagnostics.cpp
index c0a0c53be..0b7c8f5f6 100644
--- a/clang/lib/StaticAnalyzer/Checkers/RetainCountChecker/RetainCountDiagnostics.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/RetainCountChecker/RetainCountDiagnostics.cpp
@@ -501,7 +501,7 @@ RefCountReportVisitor::VisitNode(const ExplodedNode *N, BugReporterContext &BRC,
     if (const CallExpr *CE = dyn_cast<CallExpr>(S)) {
       // Iterate through the parameter expressions and see if the symbol
       // was ever passed as an argument.
-      for (auto AI=CE->arg_begin(), AE=CE->arg_end(); AI!=AE; ++AI) {
+      for (auto AI = CE->arg_begin(), AE = CE->arg_end(); AI != AE; ++AI) {
 
         // Retrieve the value of the argument.  Is it the symbol
         // we are interested in?

``````````

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https://github.com/llvm/llvm-project/pull/211983