emacs-29 e9b88f61ccc: Fix a defcustom :type

[Eli Zaretskii]

branch: emacs-29
commit e9b88f61ccce16e6aad2ad8575a25c3665f8bde4
Author: Mauro Aranda <maurooaranda@gmail.com>
Commit: Eli Zaretskii <eliz@gnu.org>

    Fix a defcustom :type
    
    * lisp/cedet/ede/base.el (ede-project-placeholder-cache-file): Expand
    :type to allow nil.  (Bug#66361)
---
 lisp/cedet/ede/base.el | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lisp/cedet/ede/base.el b/lisp/cedet/ede/base.el
index 305bf599151..c32d2edd7b7 100644
--- a/lisp/cedet/ede/base.el
+++ b/lisp/cedet/ede/base.el
@@ -312,7 +312,8 @@ All specific project types must derive from this project."
   "File containing the list of projects EDE has viewed.
 If set to nil, then the cache is not saved."
   :group 'ede
-  :type 'file)
+  :type '(choice (const :tag "Don't save the cache" nil)
+                 file))
 
 (defvar ede-project-cache-files nil
   "List of project files EDE has seen before.")