Update DynamicLibraryManager.cpp

Author: mcbarton

lib/Interpreter/DynamicLibraryManager.cpp

@@ -53,7 +53,7 @@ namespace Cpp {
     // Behaviour is to not add paths that don't exist...In an interpreted env
     // does this make sense? Path could pop into existance at any time.
     for (const char* Var : kSysLibraryEnv) {
-      if (GetEnv(Var)) {
+      if (const char* GetEnv(Var)) {
         SmallVector<StringRef, 10> CurPaths;
         SplitPaths(Env, CurPaths, utils::kPruneNonExistant, Cpp::utils::platform::kEnvDelim);
         for (const auto& Path : CurPaths)