bug#33055: 27.0.50; load-prefer-newer loads wrong file

[Juri Linkov]

> Perhaps it would be cleaner for the load statement to use the precise
> filename that it wants to load (ie, explicitly add the .el suffix)?

In a new patch I used the same variable names as in the function
smtpmail-send-it that creates these files.  But now I realized
this fix might be needed for emacs-26.  Maybe, Eli knows for sure?

diff --git a/lisp/mail/smtpmail.el b/lisp/mail/smtpmail.el
index 8bc3cc78d9..8607f9fa9c 100644
--- a/lisp/mail/smtpmail.el
+++ b/lisp/mail/smtpmail.el
@@ -404,21 +404,22 @@ smtpmail-send-queued-mail
   (with-temp-buffer
     ;; Get index, get first mail, send it, update index, get second
     ;; mail, send it, etc...
-    (let ((file-msg "")
+    (let (file-data file-elisp
           (qfile (expand-file-name smtpmail-queue-index-file
                                    smtpmail-queue-dir))
          result)
       (insert-file-contents qfile)
       (goto-char (point-min))
       (while (not (eobp))
-       (setq file-msg (buffer-substring (point) (line-end-position)))
-       (load file-msg)
+       (setq file-data (buffer-substring (point) (line-end-position)))
+       (setq file-elisp (concat file-data ".el"))
+       (load file-elisp)
        ;; Insert the message literally: it is already encoded as per
        ;; the MIME headers, and code conversions might guess the
        ;; encoding wrongly.
        (with-temp-buffer
          (let ((coding-system-for-read 'no-conversion))
-           (insert-file-contents file-msg))
+           (insert-file-contents file-data))
           (let ((smtpmail-mail-address
                  (or (and mail-specify-envelope-from (mail-envelope-from))
                      user-mail-address)))
@@ -428,8 +429,8 @@ smtpmail-send-queued-mail
                                    (current-buffer)))
                  (error "Sending failed: %s" result))
               (error "Sending failed; no recipients"))))
-       (delete-file file-msg)
-       (delete-file (concat file-msg ".el"))
+       (delete-file file-data)
+       (delete-file file-elisp)
        (delete-region (point-at-bol) (point-at-bol 2)))
       (write-region (point-min) (point-max) qfile))))