auto_assign_floating_ip fails with raceback in nova-network.log

When auto_assign_floating_ip flag is specified, the corresponding function fails on instance spawn. It seems the allocate_for_instance() method is expecting an outdated data structure to be returned as nw_info:

2012-02-26 01:53:24 DEBUG nova.network.manager [-] QUOTA: 1 from (pid=1555) allocate_floating_ip /opt/stack/nova/nova/network/manager.py:375
2012-02-26 01:53:24 ERROR nova.rpc.common [-] Exception during message handling
(nova.rpc.common): TRACE: Traceback (most recent call last):
(nova.rpc.common): TRACE: File "/opt/stack/nova/nova/rpc/amqp.py", line 250, in _process_data
(nova.rpc.common): TRACE: rval = node_func(context=ctxt, **node_args)
(nova.rpc.common): TRACE: File "/opt/stack/nova/nova/network/manager.py", line 239, in wrapped
(nova.rpc.common): TRACE: return func(self, context, *args, **kwargs)
(nova.rpc.common): TRACE: File "/opt/stack/nova/nova/network/manager.py", line 302, in allocate_for_instance
(nova.rpc.common): TRACE: for nw, info in nw_info:
(nova.rpc.common): TRACE: ValueError: too many values to unpack
(nova.rpc.common): TRACE:
2012-02-26 01:53:24 ERROR nova.rpc.common [-] Returning exception too many values to unpack to caller