message: Allow back HostMemorySpace
diff: @@ -118,7 +118,7 @@ public:
  HostMemorySpace() { }
  virtual ~HostMemorySpace() { }
  virtual void Alloc(void **ptr, size_t bytes)
  - { mfem_error(""); *ptr = std::malloc(bytes); }
  + { *ptr = std::malloc(bytes); }
  virtual void Dealloc(void *ptr) { std::free(ptr); }
  virtual void Insert(void *ptr, size_t bytes) { }
  virtual void Protect(const void *ptr, size_t bytes) { }
  