(mail-send-and-exit): Make arg optional.

lisp/ChangeLog

@@ -1,5 +1,7 @@
 2003-04-23  Richard M. Stallman  <rms@gnu.org>
 
+	* mail/sendmail.el (mail-send-and-exit): Make arg optional.
+
 	* files.el (view-read-only): Doc fix.
 
 	* simple.el (back-to-indentation): Call backward-prefix-chars.

lisp/mail/sendmail.el

@@ -686,7 +686,7 @@ If within the headers, this makes the new lines into continuation lines."
 
 ;; User-level commands for sending.
 
-(defun mail-send-and-exit (arg)
+(defun mail-send-and-exit (&optional arg)
   "Send message like `mail-send', then, if no errors, exit from mail buffer.
 Prefix arg means don't delete this window."
   (interactive "P")