fix 32-bit overflow in LZW byte-list size calculation#119
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clang -fsanitize=unsigned-integer-overflow on the byte-list size calc:
MAX_CODE_LEN * lzwPosis an intuint32_t product that wraps in 32-bit before the/8ullwidening, so for large frames (lzwPos > ~358M, reachable with in-spec widthheight) byteList/byteListBlock are sized far too small and create_byte_list overruns the heap. Widen the multiply to 64-bit.