[BUG] NoneType in sequential module in bit_ffn

[jayUyang]

self.ff sequential modules could have None, which is not callable, if post_act_ln is False.

[suggenstion]

    ff_layers = [project_in]
    if post_act_ln:
        ff_layers.append(nn.LayerNorm(inner_dim))
    ff_layers.append(nn.Dropout(dropout))
    ff_layers.append(BitLinear(inner_dim, dim_out, bias=not no_bias, *args, **kwargs))
    self.ff=nn.Sequential(*ff_layers)

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