If any error happens during multifd send thread creating (e.g. channel broke because new domain is destroyed by the dst), multifd_tls_handshake_thread may exit silently, leaving main migration thread hanging (ram_save_setup -> multifd_send_sync_main -> qemu_sem_wait(&p->sem_sync)). Fix that by adding error handling in multifd_tls_handshake_thread. Signed-off-by: Hao Wang <wanghao232@huawei.com>
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