let import_iovec deal with compat_iovecs as well

[David Laight]

> On Sat, Sep 19, 2020 at 02:24:10PM +0000, David Laight wrote:
> > I thought about that change while writing my import_iovec() => iovec_import()
> > patch - and thought that the io_uring code would (as usual) cause grief.
> >
> > Christoph - did you see those patches?

Link to cover email.

https://lkml.org/lkml/2020/9/15/661

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