There is no need to set err, it will be overwritten in any case
later at:
        if (scrub)
                err = ubi_wl_scrub_peb(ubi, pnum);
Signed-off-by: NRichard Weinberger <richard@nod.at>
Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>