(vc-find-root): Don't loop forever on non-existent root.

lisp/ChangeLog

+2008-02-16  Eli Zaretskii  <eliz@gnu.org>
+
+	* vc-hooks.el (vc-find-root): Don't loop forever on non-existent root.
+
 2008-02-14  Stefan Monnier  <monnier@pastel.home>
 	* textmodes/sgml-mode.el (sgml-mode): Fix comment syntax.

lisp/vc-hooks.el

@@ -316,7 +316,7 @@ The function walks up the directory tree from FILE looking for WITNESS.
 If WITNESS if not found, return nil, otherwise return the root."
   ;; Represent /home/luser/foo as ~/foo so that we don't try to look for
   ;; witnesses in /home or in /.
-  (while (not (file-directory-p file))
+  (while (and (not (file-directory-p file)) (file-exists-p file))
     (setq file (file-name-directory (directory-file-name file))))
   (setq file (abbreviate-file-name file))
   (let ((root nil)