Signedness revisions.

This eliminates explicit casting by switching to unsigned variables.
The revised variables are frequently used together.

* include/freetype/fttypes.h (FT_Data): Change to unsigned `length`.
* include/freetype/internal/tttypes.h (TT_LoaderRec): Change to unsigned
`byte_len`.
* include/freetype/t1tables.h (CID_FaceInfoRec): Change to unsigned
`gd_bytes` and `gd_bytes`.

* src/cff/cffgload.c (cff_get_glyph_data, cff_free_glyph_data):
Updated.
* src/cid/cidgload.c (cid_load_glyph): Updated.
* src/cid/cidload.h (cid_get_offset): Update argument.
* src/cid/cidload.c (cid_get_offset, cid_face_open): Updated.
* src/psaux/psft.c (cf2_getT1SeacComponent): Updated.
* src/truetype/ttgload.c (TT_Process_Composite_Glyph,
load_truetype_glyph): Updated.
9 files changed