ab8500_fg_inst_curr_finalize
int ab8500_fg_inst_curr_finalize(struct ab8500_fg *di, int *res);
ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
ret = ab8500_fg_inst_curr_finalize(di, &curr_ua);
ab8500_fg_inst_curr_finalize(di, &di->inst_curr_ua);