[makeotfexe] FEA token reported in syntax error is off-by-one

[miguelsousa]

When reporting a FEA syntax error triggered by finding a glyph name that is included in a glyph class but not present in the font, makeotfexe references the next token instead of the name of the missing glyph.

• If the missing glyph is the last in the class, the syntax error will reference ] (a bracket).
• If the missing glyph is NOT the last in the class, the syntax error will reference the name of the glyph that comes after the name of the missing glyph.

Test case:

makeotfexe -f t1pfa.pfa -ff features.fea

Result:

syntax error at "a" [features.fea 2]

Expected result:

syntax error at "glyph_not_found" [features.fea 2]

bug492.zip