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33bbd1de5e
signrom.sh has multiple bugs: - the last byte is considered when calculating the existing checksum, but not when computing the correction - apprently the 'expr' expression overflows and produces incorrect results with larger roms - if the checksum happened to be zero, we calculated the correction byte to be 256 Instead of rewriting this in half a line of python, this patch fixes the bugs. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>