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qemu_socket() and make_udp_socket() return a file descriptor on success, -1 on failure. The check misinterprets 0 as failure. Fix that. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-ID: <20240203080228.2766159-3-armbru@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>