exec: use macro ROUND_UP for alignment
Use ROUND_UP instead. Signed-off-by: NChen Hanxiao <chenhanxiao@cn.fujitsu.com> Message-Id: <1437707523-4910-1-git-send-email-chenhanxiao@cn.fujitsu.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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