[Tile-serving] [openstreetmap/osm2pgsql] Make some functions return void instead of int (#1021)

[Jochen Topf]

@joto pushed 1 commit.

691a78e42fc2b6e1876eee3ecabaa36bccdfea71  Avoid unused parameter warning


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View it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/1021/files/f00946f5d5036c4deba303e964e3d6a532ad4c88..691a78e42fc2b6e1876eee3ecabaa36bccdfea71
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