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

[Paul Norman]

f347bf88967ffc5d420bd284a3ded2466b7950da is the one commit remaining, as the VLAs were addressed elsewhere

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https://github.com/openstreetmap/osm2pgsql/pull/299#issuecomment-124910685
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