spice: fix coverity complains
Remove the unnecessary NULL check. Signed-off-by: NGonglei <arei.gonglei@huawei.com> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Message-id: 1463047028-123868-3-git-send-email-arei.gonglei@huawei.com Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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