Make helpers static/anonymous.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@168500 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/StaticAnalyzer/Checkers/MallocChecker.cpp b/lib/StaticAnalyzer/Checkers/MallocChecker.cpp
index aadf2dd..33f68b6 100644
--- a/lib/StaticAnalyzer/Checkers/MallocChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/MallocChecker.cpp
@@ -627,8 +627,8 @@
 
 /// Checks if the previous call to free on the given symbol failed - if free
 /// failed, returns true. Also, returns the corresponding return value symbol.
-bool didPreviousFreeFail(ProgramStateRef State,
-                         SymbolRef Sym, SymbolRef &RetStatusSymbol) {
+static bool didPreviousFreeFail(ProgramStateRef State,
+                                SymbolRef Sym, SymbolRef &RetStatusSymbol) {
   const SymbolRef *Ret = State->get<FreeReturnValue>(Sym);
   if (Ret) {
     assert(*Ret && "We should not store the null return symbol");