When hotplug ovs kernel netcard, even tap TUNGETIFF failed, the hotplug would go on and would lead to qemu assert. The failure should lead to the free_fail. Signed-off-by: miaoyubo <miaoyubo@huawei.com> Signed-off-by: Yan Wang <wangyan122@huawei.com> Signed-off-by: imxcc <xingchaochao@huawei.com> (cherry picked from commit fcfc664bacbb7d51d667dd6d0c20ce088bc7effe)
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