ubi_eba_read_leb
err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0);
ret = ubi_eba_read_leb(ubi, vol, lnum,
err = ubi_eba_read_leb(ubi, vol, lnum, buf, offset, len, check);
err = ubi_eba_read_leb(ubi, vol, i, buf, 0, size, 1);
int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,