[Tile-serving] [osm2pgsql] Fix incorrect resizing of node cache in geometry processor (#322)

[Paul Norman]

Passes `make check`.

No performance change on a 331 MB PBF pgsql backend with or without `--slim`, with `--number-processes 8`

cc @charterchap @kevinkreiser 

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/322#issuecomment-88599613
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