cwen cd0438c481 ish: fix an infinite loop on unsigned char archs
Decoding using the -lf option on powerpc made ish freeze. A looped
fgetc(3) call never reached EOF, since the return value was stored
as a char, that is unsigned on powerpc and arm*, instead of int.

OK jca@
2021-07-24 19:26:54 +00:00
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