Remove confusion of C-c C-o in footnote with cursor on link

* lisp/org.el (org-open-at-point): Don't do footnote action if cursor is
on a bracket link.

Sebastian Mengin writes:

> Hi,
>
> Consider the following minimal example:
>
> Text[fn:1]
>
> * Footnotes
> [fn:1] Note with a [[file:abecedaire.jpg][link]].
>
> Here with orgmode 7.02, doing C-c C-o on the link moves the cursor on
> [fn:1] and says in the minibuffer: "Position saved mark to ring, go back
> with C-c &", instead of opening the linked file.
>
> Is this a bug?
>

lisp/org.el

@@ -9080,7 +9080,8 @@ application the system uses for this file type."
 	(progn (require 'org-attach) (org-attach-reveal 'if-exists))))
    ((run-hook-with-args-until-success 'org-open-at-point-functions))
    ((org-at-timestamp-p t) (org-follow-timestamp-link))
-   ((or (org-footnote-at-reference-p) (org-footnote-at-definition-p))
+   ((and (or (org-footnote-at-reference-p) (org-footnote-at-definition-p))
+	 (not (org-in-regexp org-bracket-link-regexp)))
     (org-footnote-action))
    (t
     (let (type path link line search (pos (point)))