PSPP-BUG: [patch #5209] Proposed casefile changes

[Ben Pfaff]

Follow-up Comment #8, patch #5209 (project pspp):

> Do you think it would be a good idea to factor out the _xfer functions?
Ie,
> casefile.c can do the ownership transfer, so that implementations don't
need
> to provide a _xfer versions of their own? I expect it'll make
implementations
> easier and less error prone.

At first I was going to explain why the _xfer variant is different and should
be treated differently, in the case of a destructive reader.  But then I
realized that, in fact, I was just wrong.  I don't think there's any reason
to have two different interfaces here.  Just merge them.

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