[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");

Then fix it correctly by discarding ways with 0 nodes. Before your change the malloc(0)'d pointer was never dereferenced, so things happened to work fine.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/299/files#r25124430
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