[Tile-serving] [osm2pgsql] Incorrect multi backend linestring geoms (#274)

[Sarah Hoffmann]

Thanks, that made it easy to find the bug in `way_helper::set`. As the size of the node_cache is only changed [here](https://github.com/openstreetmap/osm2pgsql/blob/master/geometry-processor.cpp#L79) when the ways is longer than the previously requested way, the return [here](https://github.com/openstreetmap/osm2pgsql/blob/master/geometry-processor.cpp#L83) is obviously too large if the way is smaller. Unfortunately, node_cache.size() is used in output-multi.cpp as well.

The correct fix would be to make `nodes_get_list` use std::vector and set the size correctly. Undecided right now what the second best fix is. Probably a second `resize()` just before the return using the result of `nodes_get_list`. 

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/274#issuecomment-73321340
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