[Tile-serving] [openstreetmap/osm2pgsql] Potential memory leak when running without flatnode option (#931)

[timautin]

@lonvia yes, here's what I added at the end of my postgresql.conf:

```
random_page_cost = 1.1
wal_buffers = 16MB
effective_cache_size = 48GB
maintenance_work_mem = 4GB
shared_buffers = 8MB
work_mem = 128MB
autovacuum = on
effective_io_concurrency = 200
max_connections = 300
checkpoint_completion_target = 0.7
default_statistics_target = 100
min_wal_size = 1GB
max_wal_size = 4GB
max_worker_processes = 12
max_parallel_workers_per_gather = 6
max_parallel_workers = 12
```

Do you see something wrong?

I exchanged my server with another one. The GDAL problem is gone, so I indeed had a hardware problem. But I still get the same behavior for osm2pgsql.

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