Error on legacy.nn serialization

[szagoruyko]

repro:

import torch                                                                                                                            
import torch.legacy.nn as nn

net = nn.Sequential()
net.add(nn.SpatialConvolution(3,3,3,3,1,1))
torch.save(net, open('model.pt7', 'wb'))

[apaszke]

Fixed in d1fda53.