mm,hwpoison-inject: don't pin for hwpoison_filter

Another memory error injection interface debugfs:hwpoison/corrupt-pfn also
takes bogus refcount for hwpoison_filter().  It's justified because this
does a coarse filter, expecting that memory_failure() redoes the check for
sure.

Signed-off-by: Naoya Horiguchi <[email protected]>
Signed-off-by: Oscar Salvador <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Cc: "Aneesh Kumar K.V" <[email protected]>
Cc: Aneesh Kumar K.V <[email protected]>
Cc: Aristeu Rozanski <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Dmitry Yakunin <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Mike Kravetz <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: Qian Cai <[email protected]>
Cc: Tony Luck <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>

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