marcel 2cbd733015 Fix checksum calculation:
1.  Iterate over all partitions counted in the label, which can be more
    than the number of partitions given to mkimg(1).
2.  Start the checksum from the beginning of the label; not the beginning
    of the bootarea.

Tested with bsdlabel(8).

MFC after:	3 days
2014-09-12 03:54:16 +00:00
..
2014-09-12 03:54:16 +00:00
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