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50e2de0730
upekts will need to know when the first enrollment stage is attempted for the first time, so add an __enroll_stage counter which actually indicates the next stage to enroll. -1 is a special value and it means 0 is next *and* it is the initial attemt. Added more debug output to the enroll handler. Added new fp_enroll_status codes for too short or uncentered scans. Changed the print_data allocator to consider the device rather than the driver, this feels more natural. Added missing return value. Make fp_enroll_status codes start at 1. 0 can now be used as a special/temporary value by the drivers. Also check that we aren't exceeding the number of enroll stages. Also add a missing exit() call to the verify example and update for the above.
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