[Tile-serving] [openstreetmap/osm2pgsql] Fixes UB (division by zero) (#1029)

[Jochen Topf]

This is triggered in some of our tests.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1029

-- Commit Summary --

  * Fixes UB (division by zero)

-- File Changes --

    M src/node-ram-cache.cpp (8)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1029.patch
https://github.com/openstreetmap/osm2pgsql/pull/1029.diff

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