aio: use the macro rather than the inline magic number
Replace the inline magic number with the ready-made macro(AIO_RING_MAGIC), just clean up. Reviewed-by: NJeff Moyer <jmoyer@redhat.com> Signed-off-by: NGu Zheng <guz.fnst@cn.fujitsu.com> Signed-off-by: NBenjamin LaHaise <bcrl@kvack.org>
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