[Emacs-diffs] master 37b88d7b: Fix bug#23006

[Tino Calancha]

After this commit the test `tramp-test06-directory-file-name'
fails in my machine with:

(ert-test-failed
     ((should
       (string-equal
        (file-name-as-directory file)
        (if ... file ...)))
      :form
      (string-equal "/mock:" "/mock:./")
      :value nil))


In GNU Emacs 26.0.50 (build 10, x86_64-pc-linux-gnu, GTK+ Version 3.22.8)
 of 2017-03-10
Repository revision: cfb8f12619beb1c84a5b22ee2edfefa5387b60b5
Windowing system distributor 'The X.Org Foundation', version 11.0.11901000
System Description:     Debian GNU/Linux 9.0 (stretch)