st_forward_space_files
rval = st_forward_space_files(un, files);
ST_FUNC(ST_DEVINFO, st_forward_space_files);
return (st_forward_space_files(un, files));
rval = st_forward_space_files(un, -count);
static int st_forward_space_files(struct scsi_tape *un, int64_t files);