sockets: avoid crash when cleaning up sockets for an invalid FD
If socket_listen_cleanup is passed an invalid FD, then querying the socket local address will fail. We must thus be prepared for the returned addr to be NULL Reported-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
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