Fix position in empty buffers in checkdoc-file-comments-engine

* lisp/emacs-lisp/checkdoc.el (checkdoc-file-comments-engine):
Don't give invalid positions on empty buffers (bug#39987).

1 files changed, 3 insertions, 1 deletions

diff --git a/lisp/emacs-lisp/checkdoc.el b/lisp/emacs-lisp/checkdoc.el
index 76638ec13b1..9722792a5a5 100644
--- a/lisp/emacs-lisp/checkdoc.el
+++ b/lisp/emacs-lisp/checkdoc.el
@@ -2362,7 +2362,9 @@ Code:, and others referenced in the style guide."
                 (checkdoc-create-error
                  (format "The footer should be: (provide '%s)\\n;;; %s%s ends here"
                          fn fn fe)
-                 (1- (point-max)) (point-max)))))
+                 ;; The buffer may be empty.
+                 (max (point-min) (1- (point-max)))
+                 (point-max)))))
         err))
       ;; The below checks will not return errors if the user says NO