[analyzer] Cleanup: use the variable.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@146056 91177308-0d34-0410-b5e6-96231b3b80d8

lib/StaticAnalyzer/Core/ProgramState.cpp

@@ -665,7 +665,7 @@ const ProgramState* ProgramState::addTaint(SymbolRef Sym,
 
 bool ProgramState::isTainted(const Stmt *S, TaintTagType Kind) const {
   SVal val = getSVal(S);
-  return isTainted(getSVal(S), Kind);
+  return isTainted(val, Kind);
 }
 
 bool ProgramState::isTainted(SVal V, TaintTagType Kind) const {