master 53ebc1fa21: * lisp/doc-view.el (doc-view-epub-font-size): Fix type; add version.

[Glenn Morris]

branch: master
commit 53ebc1fa21f068862753de6cb6a8eb4ad71d8a40
Author: Glenn Morris <rgm@gnu.org>
Commit: Glenn Morris <rgm@gnu.org>

    * lisp/doc-view.el (doc-view-epub-font-size): Fix type; add version.
    
    Flagged by test-custom-opts.
---
 lisp/doc-view.el | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lisp/doc-view.el b/lisp/doc-view.el
index ee6aa05517..b222096ac6 100644
--- a/lisp/doc-view.el
+++ b/lisp/doc-view.el
@@ -254,8 +254,9 @@ Can be `dvi', `pdf', `ps', `djvu', `odf', 'epub', `cbz', 
`fb2',
 
 (defcustom doc-view-epub-font-size nil
   "Font size in points for EPUB layout."
-  :type 'integer
-  :set #'doc-view-custom-set-epub-font-size)
+  :type '(choice (const nil) integer)
+  :set #'doc-view-custom-set-epub-font-size
+  :version "29.1")
 
 (defcustom doc-view-scale-internally t
   "Whether we should try to rescale images ourselves.