[Tile-serving] [osm2pgsql] Foot conversion goes out of range (#156)

[Paul Norman]

[Within the real conversion](https://github.com/openstreetmap/osm2pgsql/blob/b325f197bb4a6bdded74ecd59fea147fb36bb24a/output-pgsql.c#L330) we have this code
```c
if ((tmpstr[slen-2]=='f') && (tmpstr[slen-1]=='t')) {
  from*=0.3048;
}
sprintf(sql, "%f", from);
```

For small values (e.g. a way_area of 4) ``slen-2`` is negative, checking a value outside the string.

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/156
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