[Tile-serving] [openstreetmap/osm2pgsql] Fix overflow in fmt lib in middle test (PR #1658)

[Jochen Topf]

Compiling with UB sanitizer shows an overflow in the fmt library triggered by our code:

fmt/format-inl.h:1984:56: runtime error: unsigned integer overflow: 100000000 * 9876243 cannot be represented in type 'unsigned int'

This change fixes that.

And actually tests that locations read back are the same as original
ones.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1658

-- Commit Summary --

  * Fix overflow in fmt lib in middle test

-- File Changes --

    M tests/test-middle.cpp (9)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1658.patch
https://github.com/openstreetmap/osm2pgsql/pull/1658.diff

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