Fix device handling in nn.utils.rnn.unpad_sequence

[anton-bushuiev]

Without this change I get the following error.

line 444, in unpad_sequence
    mask = idx < length
RuntimeError: Expected all tensors to be on the same device, but found at least two devices, cuda:0 and cpu!

[pytorch-bot]

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[mikaylagawarecki]

@pytorchbot merge

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[mikaylagawarecki]

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