scatter_logsumexp incorrect behaviour with -inf src tensor

[wangben88]

Hi,

The scatter_logsumexp function seems to produce an incorrect result when the src Tensor has -inf values; as a minimal example:

import torch
from torch_scatter import scatter_logsumexp

src = torch.Tensor([-torch.inf, -torch.inf])
index = torch.tensor([0, 0])
scatter_logsumexp(src=src, index=index)

produces 0.0, rather than -inf. I found #369 which seems to introduce this bug.

Thanks!

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