tilespec.c: unscaled_tileset uninitialized
unscaled_tileset in the tilespec.c is not initialized, but is assumed to always have a sensible value (NULL to indicate that it's not set)
Also to S2_6
unscaled_tileset in the tilespec.c is not initialized, but is assumed to always have a sensible value (NULL to indicate that it's not set)