[1.7] rename/renameat error

[Eric Blake]

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According to Christopher Faylor on 9/26/2009 8:57 AM:
>> But how does it look now?
> 
> It looks good.  Thanks.  Please check in.

I missed one corner case in my testing; how about this followup?

2009-09-29  Eric Blake  <ebb9@byu.net>

	* syscalls.cc (rename): Fix regression on rename("dir","d/").

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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