MDL-43178 mod_forum: fixed the digest setting confirmation message

mod/forum/lib.php

@@ -8498,8 +8498,6 @@ function forum_set_user_maildigest($forum, $maildigest, $user = null) {
             $subscription->id = $DB->insert_record('forum_digests', $subscription);
         }
     }
-
-    return true;
 }
 
 /**

mod/forum/maildigest.php

@@ -52,7 +52,8 @@ $digestoptions = forum_get_user_digest_options();
 $info = new stdClass();
 $info->name  = fullname($USER);
 $info->forum = format_string($forum->name);
-$info->maildigest = forum_set_user_maildigest($forum, $maildigest);
+forum_set_user_maildigest($forum, $maildigest);
+$info->maildigest = $maildigest;
 
 if ($maildigest === -1) {
     // Get the default maildigest options.