[Tile-serving] [osm2pgsql] Cleanup based on the output of LLVM's static analyzer (#299)

[Sarah Hoffmann]

>          int nodec;
>  
> +        assert(ndc > 0 && "no nodes to proccess");

Really? Is this guaranteed anywhere further up in the processing chain? I would not assume that OSM data does not contain ways without nodes.

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https://github.com/openstreetmap/osm2pgsql/pull/299/files#r25123742
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