(elmo-nntp-default-user): Customization Type fix.

diff --git a/elmo/elmo-vars.el b/elmo/elmo-vars.el
index 9400912..7d6d0e7 100644 (file)
--- a/elmo/elmo-vars.el
+++ b/elmo/elmo-vars.el
@@ -131,7 +131,8 @@ This is taken precedence over `elmo-network-stream-type-alist'.")
 
 (defcustom elmo-nntp-default-user nil
   "*Default User of NNTP.  nil means no user authentication."
-  :type 'string
+  :type '(choice (const nil)
+                string)
   :group 'elmo
   :group 'elmo-setting)