[PATCH] Fix failure to update dirpath with Gluster - bug https://bugzilla.samba.org/show_bug.cgi?id=135850

[Jeremy Allison]

Fixes bug https://bugzilla.samba.org/show_bug.cgi?id=13585,
as Gluster now needs a "." path passed in instead of a
pointer to '\0', which we were using before in the non-optimization
path return from check_parent_exists().

Makes the code clearer (expands one return path into two).

Based on code from Anoop C S <anoopcs at redhat.com> and
confirmed fixes the problem by Anoop.

Please review and push if happy !

Thanks,

	Jeremy.
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