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A bit was masked, but not shifted, and that led to worst-case accesses
of index 24 in an array with 4 members.

I've improved readability in the variable declaration block as well.

Thanks to Stephen Kou for reporting the bug.

Corresponding to flashrom svn r1076.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stephen Kou <stephen@hyarros.com>