[PATCH] posix: fix split() for the case where the path is at the root of the filesystem

[Remy Blank]

Mads Kiilerich wrote:
> But please wrap the commit message at 80 characters (or slightly less).
> 
> And this posix.split apparently needs some test coverage. That could be 
> a couple of doc test cases, tested from test-doctest.py ...

Thanks for the feedback. Update coming shortly.

-- Remy

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