The get_fru_area_str() function is used to decode FRU area
fields into text. Areas may be encoded as text, binary,
BCDplus or 6-bit ASCII. Decoding of 6-bit ASCII and BCDplus
was broken. There was an error in the formulas used to
calculate the resulting string length, plus the decoding
formulas for BCDplus was wrong.
For BCDplus the resulting length was considered equal
the encoded data length, while in fact it's twice as big.
Only one character instead of two was being extracted from
a single input byte while two nibbles must have been taken
into account.
For 6-bit ASCII rounding of 3 to 4 bytes conversion was done
improperly adding 2 to the original length instead of the
result of multiplication.
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