mm/madvise.c: fix return value of madvise_hwpoison()
The return value outside for loop is always zero which means madvise_hwpoison return success, however, this is not truth for soft_offline_page w/ failure return value. Signed-off-by: NWanpeng Li <liwanp@linux.vnet.ibm.com> Reviewed-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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