simplify the argument passing (use a pointer to bus_dma_segment_t instead of separate addr/len pairs).
simplify the argument passing (use a pointer to bus_dma_segment_t instead
of separate addr/len pairs).

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars