[Tile-serving] [openstreetmap/osm2pgsql] Make sure PostgreSQL connection is cleaned up properly. (#1011)

[Jochen Topf]

PQfinish(m_conn) must also be called if the connection attempt fails.
(The destructor is not run unless the constructor succeeds.)

Also declares destructor noexcept.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1011

-- Commit Summary --

  * Make sure PostgreSQL connection is cleaned up properly.

-- File Changes --

    M src/pgsql.cpp (3)
    M src/pgsql.hpp (4)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1011.patch
https://github.com/openstreetmap/osm2pgsql/pull/1011.diff

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