bug#2631: get-free-disk-space when default-directory doesn't exist

[Kevin Ryde <user42@zip.com.au>]

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reopen 2631
retitle 2631 get-free-disk-space when home dir also doesn't exist
tags 2631 +patch
thanks

If both default-directory and home directory both don't exist
get-free-disk-space still gets an error

    (progn
      (setq default-directory "/no/such/dir")
      (setenv "HOME" "/another/no/such/dir")
      (get-free-disk-space "/"))
    => (file-error "Setting current directory" "no such file or directory" "/another/no/such/dir/")

Although plenty of things probably depend on a home dir I don't think
get-free-disk-space needs to be one of them.

Change below is like what's also in the following funcs, I believe for
the same purpose, ie. just to make sure call-process will be happy, when
the program run doesn't care about the current directory.

    Man-init-defvars,
    mail-source-movemail
    message-send-mail-with-sendmail
    sendmail-send-it
    gamegrid-add-score-with-update-game-score-1



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*** files.el	28 Mar 2009 09:50:47 +1100	1.1041
--- files.el	28 Mar 2009 09:56:48 +1100	
***************
*** 5336,5352 ****
        (save-match-data
  	(with-temp-buffer
  	  (when (and directory-free-space-program
! 		     (let ((default-directory
! 			     (if (and (not (file-remote-p default-directory))
! 				      (file-directory-p default-directory)
! 				      (file-readable-p default-directory))
! 				 default-directory
! 			       (expand-file-name "~/"))))
! 		       (eq (call-process directory-free-space-program
! 					 nil t nil
! 					 directory-free-space-args
! 					 dir)
! 			   0)))
  	    ;; Usual format is a header line followed by a line of
  	    ;; numbers.
  	    (goto-char (point-min))
--- 5336,5349 ----
        (save-match-data
  	(with-temp-buffer
  	  (when (and directory-free-space-program
! 		     (progn
! 		       (setq dir (expand-file-name dir)) ;; in case relative
! 		       (let ((default-directory "/"))
! 			 (eq (call-process directory-free-space-program
! 					   nil t nil
! 					   directory-free-space-args
! 					   dir)
! 			     0))))
  	    ;; Usual format is a header line followed by a line of
  	    ;; numbers.
  	    (goto-char (point-min))