[sfnt] Fix color stop bounds check caclculation at table end.
Fixes https://bugs.chromium.org/p/skia/issues/detail?id=14021.
- src/sfnt/ttcolr.c (tt_face_get_colorline_stops): Fix bounds check calculation off-by-one, take VarColorStop into account and hopefully make it easier to read.
Edited by Dominik Röttsches