* lisp/org-lint.el (org-lint-undefined-footnote-reference): Do not
warn when definition is inline.
* testing/lisp/test-org-lint.el (test-org-lint/undefined-footnote-reference):
Add tests.
Reported-by: Eric S Fraga <esflists@gmail.com>
<http://lists.gnu.org/archive/html/emacs-orgmode/2017-08/msg00577.html>