bug#74881: 31.0.50; [PATCH] * lisp/vc/ediff-util.el: Remove temp files on kill-emacs

[Lin Sun]

Hi Eli,

I checked the "ediff-delete-temp-files", it should be safe for executing.  Is 
it more safe to wrap it with `ignore-errors` ? Like: 

+(defun ediff--delete-temp-files-on-kill-emacs ()
+  "Delete the temp-files associated with the ediff buffers."
+  (dolist (b (buffer-list))
+    (with-current-buffer b
+      (when (eq major-mode 'ediff-mode)
+        (ignore-errors (ediff-delete-temp-files))))))