[analyzer]Fixup r156215: use StopTracking summary instead of ScratchArgs

As per Jordy's and Ted's comment, use the default StopTracking summary
instead of adding all arguments to ScratchArs.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@156310 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp b/lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp
index 2cf9353..325a765 100644
--- a/lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp
@@ -1005,10 +1005,8 @@
       ScratchArgs = AF.add(ScratchArgs, 2, StopTracking);
       S = getPersistentSummary(RetEffect::MakeNoRet(), DoNothing, DoNothing);
     } else if (CME && CME->hasNonZeroCallbackArg()) {
-      // Allow objects to escape throug callbacks. radar://10973977
-      for (unsigned I = 0; I < CME->getNumArgs(); ++I)
-        ScratchArgs = AF.add(ScratchArgs, I, StopTracking);
-      S = getPersistentSummary(RetEffect::MakeNoRet(), DoNothing, DoNothing);
+      // Allow objects to escape through callbacks. radar://10973977
+      S = getPersistentStopSummary();
     }
 
     // Did we get a summary?