[xml] timsort.h error handling

[Ralf Junker <ralfjunker gmx de>]

On memory reallocation error, timsort.h just prints to stderr and exits (see code extract below). Should it 
not better propagate the error to the libxml2 error handler?

Ralf

static void TIM_SORT_RESIZE(TEMP_STORAGE_T *store, const size_t new_size)
{
  if (store->alloc < new_size)
  {
    SORT_TYPE *tempstore = (SORT_TYPE *)realloc(store->storage, new_size * sizeof(SORT_TYPE));
    if (tempstore == NULL)
    {
      fprintf(stderr, "Error allocating temporary storage for tim sort: need %lu bytes", sizeof(SORT_TYPE) * 
new_size);
      exit(1);
    }
    store->storage = tempstore;
    store->alloc = new_size;
  }
}