[Tile-serving] [osm2pgsql] Reduce memory usage of node cache (#360)

[Dane Springmeyer]

> The error was caused by an integer overflow due to missing conversions from 32 to 64 bit. This is fixed now.

Nice job fixing! Not sure how you tracked the problem down but just wanted to add that I've been enjoying using `clang++ -Wshorten-64-to-32` to uncover these types of bugs in mapnik (https://github.com/mapnik/mapnik/issues/2907). So if you've not heard of / or are already using that flag you might want to.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/360#issuecomment-114614237
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