[Tile-serving] [openstreetmap/osm2pgsql] Error in `osm2pgsql': corrupted double-linked list: 0x000000005064bed0 (#723)

[Paul Norman]

`tagtransform-lua.cpp:108` has `out_tags.emplace_back(key, value);`, where out_tags is the 5th parameter to `lua_tagtransform_t::filter_tags`. Going up to `geometry-processor.cpp:104` has the function

```cpp
 multitaglist_t relation_helper::get_filtered_tags(tagtransform_t *transform,
                                                   export_list const &el) const
 {
A     multitaglist_t filtered(roles.size());
 
     size_t i = 0;
     for (auto const &w : data.select<osmium::Way>()) {
B        transform->filter_tags(w, nullptr, nullptr, el, filtered[++i]);
     }
 
     return filtered;
```

because roles.size = the number of ways in many cases, on the last iteration of the loop, B is trying to read from i+1 where i = roles.size(), which is out of bounds.

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