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

[timautin]

@lonvia Valgrind didn't find anything:

`Osm2pgsql took 231s overall
node cache: stored: 2398306(100.00%), storage efficiency: 51.26% (dense blocks: 59, sparse nodes: 2097741), hit rate: 100.00%
==7638== Warning: set address range perms: large range [0x59e43028, 0x7b0e43058) (noaccess)
==7638== 
==7638== HEAP SUMMARY:
==7638==     in use at exit: 0 bytes in 0 blocks
==7638==   total heap usage: 11,326,339 allocs, 11,326,339 frees, 35,209,940,432 bytes allocated
==7638== 
==7638== All heap blocks were freed -- no leaks are possible
==7638== 
==7638== For counts of detected and suppressed errors, rerun with: -v
==7638== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
`

I'm suspecting a hardware problem: when tring to import my contours shapefiles to PostGIS with ogr2ogr, after a few hours the server crashes and reboots. I just reinstalled everything from scratch and the problem is still there. It worked on another server, with the same version of GDAL. On the other hand, I asked Hetzner (my host) to run a hardware checkup and it didn't find anything. It doesn't mean that there's no problem though.

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