[sfnt] Correct FT_ColorStopIterator documentation.
- include/freetype/ftcolor.h (FT_ColorStopIterator): the user should not
set
p
to NULL before callingFT_Get_Colorline_Stops
.p
andnum_color_stops
are set byFT_Get_Paint
.p
andcurrent_color_stop
are updated byFT_Get_Colorline_Stops
.