* lisp/org-agenda.el (org-agenda-bulk-mark): truly make arg optional
as advertised by the function

Problem here was that org-agenda-bulk-toggle calls org-agenda-bulk-mark
with no parameters; however, the (max arg 1) call inside
org-agenda-bulk-mark
will fail with no parameter.  Change the max to an or and all is well.

This is my first patch for org so apologies for any inadvertent missteps

TINYCHANGE
---
 lisp/org-agenda.el |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/org-agenda.el b/lisp/org-agenda.el
index 0ffaadb..4e9473d 100644
--- a/lisp/org-agenda.el
+++ b/lisp/org-agenda.el
@@ -8299,7 +8299,7 @@ This is a command that has to be installed in
`calendar-mode-map'."
 (defun org-agenda-bulk-mark (&optional arg)
   "Mark the entry at point for future bulk action."
   (interactive "p")
-  (dotimes (i (max arg 1))
+  (dotimes (i (or arg 1))
     (unless (org-get-at-bol 'org-agenda-diary-link)
       (let* ((m (org-get-at-bol 'org-hd-marker))
      ov)
-- 
1.7.9.2