Allow vc-sccs-diff to work with TRAMP

* lisp/vc/vc-sccs.el (vc-sccs-diff): If the diff command is to be
run remotely, then the temporary files it's acting on must be
remote too (bug#37777).

Copyright-paperwork-exempt: yes

1 files changed, 2 insertions, 2 deletions

diff --git a/lisp/vc/vc-sccs.el b/lisp/vc/vc-sccs.el
index 805e738f7a9..b59d8178fe8 100644
--- a/lisp/vc/vc-sccs.el
+++ b/lisp/vc/vc-sccs.el
@@ -347,7 +347,7 @@ Remaining arguments are ignored."
       (message "Running %s in foreground..." fake-command))
     (if oldproc (delete-process oldproc))
     (dolist (file files)
-      (let ((oldfile (make-temp-file "vc-sccs"))
+      (let ((oldfile (make-nearby-temp-file "vc-sccs"))
             newfile)
         (unwind-protect
             (progn
@@ -364,7 +364,7 @@ Remaining arguments are ignored."
                      (this-status
                       (apply 'process-file "diff" nil t nil
                              (append (vc-switches 'SCCS 'diff)
-                                     (list oldfile
+                                     (list (file-local-name oldfile)
                                            (or newfile
                                                (file-relative-name file)))))))
                 (or (integerp this-status) (setq status 'error))