[Tile-serving] [openstreetmap/mod_tile] Fix memory leak during configuration parsing (PR #455)

[Hummeltech]

The memory allocated by `strndup` needs to be freed.

The code has also been changed to not lose the allocation pointer and according to the semantics of `strtok_r` explained here:
https://man.freebsd.org/cgi/man.cgi?query=strtok_r

Also improved messaging.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/mod_tile/pull/455

-- Commit Summary --

  * Fix memory leak during configuration parsing
  * Clear things up

-- File Changes --

    M src/renderd.c (8)
    M src/renderd_config.c (7)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/455.patch
https://github.com/openstreetmap/mod_tile/pull/455.diff

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