We currently call `git_strmap_free` on `checkout_data.mkdir_map` in the
`checkout_data_clear` function. The only thing protecting us from a
double-free is that the `git_strmap_free` function is in fact not a
function, but a macro that also sets the map to NULL.
Remove the second call to `git_strmap_free` and explicitly set the map
member to NULL.
git__free(data->pfx);
data->pfx = NULL;
- git_strmap_free(data->mkdir_map);
-
git_buf_free(&data->target_path);
git_buf_free(&data->tmp);
data->index = NULL;
git_strmap_free(data->mkdir_map);
+ data->mkdir_map = NULL;
git_attr_session__free(&data->attr_session);
}