fix two more s390/sparc gup_fast bugs

[Andrea Arcangeli]

Hi,

I just noticed return 0 was missing after rolling back *nr, that's not
ok as then gup_fast wouldn't abort and it would put pages in the wrong
offset in the array I think... This isn't related to the recent
changes, it was the same in 2.6.37. I don't think it's ok to return 1
after rolling back *nr.

These next two are incremental with the previous.
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