[smooth, raster, sdf] Clean up initialization calls.

* src/raster/ftraster.c (ft_black_init): Removed.
(ft_black_new): Clean up.
* src/sdf/ftbsdf.c (bsdf_raster_new): Ditto.
* src/sdf/ftsdf.c (sdf_raster_new): Ditto.
* src/smooth/ftgrays.c (gray_raster_new): Ditto.
4 files changed