[Tile-serving] [osm2pgsql] Move variable declaration in #ifdef block its used in (#442)

[Paul Norman]

For setups without `HAVE_POSIX_FALLOCATE` there was an unused variable.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/442

-- Commit Summary --

  * Move variable declaration in #ifdef block its used in

-- File Changes --

    M node-persistent-cache.cpp (6)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/442.patch
https://github.com/openstreetmap/osm2pgsql/pull/442.diff

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https://github.com/openstreetmap/osm2pgsql/pull/442
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