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54469a6918
When modifying the Optional Data of a boot option with bcfg boot -opt the result was corrupted data, for instance a concatenation of old data, heap contents, and new data. This was due to a erronous calculation of the original optional data length. In addition to fixing the calculation, add explaining comments and introduce a helper variable, to not abuse other variables and confuse readers (including the author). Signed-off-by: Tormod Volden <debian.tormod@gmail.com>