message: Fix setString in MPI distributed device
diff: @@ -263,7 +263,7 @@ namespace ospray {
  const char *s)
  {
  auto *object = lookupObject<ManagedObject>(_object);
  - object->findParam(bufName, true)->set(s);
  + object->findParam(bufName, true)->set(std::string(s));
  }
  int MPIDistributedDevice::loadModule(const char *name)
  