mm: vmpressure: don't need call kfree if kstrndup fails
When kstrndup fails, no memory was allocated and we can exit directly. [david@redhat.com: reword changelog] Signed-off-by: NYang Shi <yang.shi@linux.alibaba.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Reviewed-by: NAndrew Morton <akpm@linux-foundation.org> Reviewed-by: NDavid Hildenbrand <david@redhat.com> Acked-by: NDavid Rientjes <rientjes@google.com> Link: http://lkml.kernel.org/r/1581398649-125989-1-git-send-email-yang.shi@linux.alibaba.comSigned-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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