[PATCH] Fix path::iterator post-increment and post-decrement

[Jonathan Wakely]

On 19/10/17 15:00 +0100, Jonathan Wakely wrote:
>I made a dumb mistake in the post-inc and post-dec operators for
>the path::iterator type, forgetting that _M_cur is sometimes null (for
>a single-element path).
>
>	* include/experimental/bits/fs_path.h (path::iterator++(int))
>	(path::iterator--(int)): Fix for paths with only one component.
>	* testsuite/experimental/filesystem/path/itr/traversal.cc: Test
>	post-increment and post-decrement.

And I made another dumb mistake in the new test, incrementing an end
iterator. It was caught by testing with _GLIBCXX_ASSERTIONS though.

Tested powerpc64le-linux, committed to trunk and gcc-7-branch.


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