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l2tpv3: fix possible double free
freeaddrinfo(result) does not assign result = NULL, after frees it. There will be a double free when it goes error case. It is reported by covertiy. Reviewed-by: NGonglei <arei.gonglei@huawei.com> Cc: qemu-stable@nongnu.org Signed-off-by: Nzhanghailiang <zhang.zhanghailiang@huawei.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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