master 119a9ec: * lisp/net/tramp.el: Make last change backward compatible.

[Michael Albinus]

branch: master
commit 119a9ecfe1183f3b6f99a885689d10739687dcc8
Author: Michael Albinus <michael.albinus@gmx.de>
Commit: Michael Albinus <michael.albinus@gmx.de>

    * lisp/net/tramp.el: Make last change backward compatible.
---
 lisp/net/tramp.el | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lisp/net/tramp.el b/lisp/net/tramp.el
index fdf26f6..d8113a9 100644
--- a/lisp/net/tramp.el
+++ b/lisp/net/tramp.el
@@ -3814,9 +3814,12 @@ support symbolic links."
            (setq current-buffer-p t)
            (current-buffer))
           (t (get-buffer-create
+              ;; These variables have been introduced with Emacs 28.1.
               (if asynchronous
-                  shell-command-buffer-name-async
-                shell-command-buffer-name)))))
+                  (or (bound-and-true-p shell-command-buffer-name-async)
+                      "*Async Shell Command*")
+                (or (bound-and-true-p shell-command-buffer-name)
+                    "*Shell Command Output*"))))))
         (error-buffer
          (cond
           ((bufferp error-buffer) error-buffer)