config_mbr: Fix integer overflow

The values need to be converted to loff_t *before* performing
the multiplication, else any sector offset past MAX_INT
bytes will overflow.

Change-Id: Ib8992f28aa4119ac7b4ad354b2448c4b0cfaf846
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
1 file changed