[PATCH] Fix Gluster bug - unable to create file/directory under root of the share due to empty dirpath during get_real_filename()

[Jeremy Allison]

As confirmed by Anoop, this is a much simpler
and direct patch that adds the protection already
in get_real_filename_full_scan() to get_real_filename().

Fixes an error when used with Glusterfs.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13585

Please review and push if happy !

Cheers,

	Jeremy.
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