gtk_clist_set_row_data_full() bug

[Damon Chaplin <damon karuna freeserve co uk>]

I've just noticed that gtk_clist_set_row_data_full() isn't calling
the destroy function on the old data, which means memory may be leaked.

I think these 2 lines need to be added:

  if (clist_row->destroy)
    clist_row->destroy (clist_row->data);


Damon