[O] org-babel src block generated graphics included twice if CAPTION is added

[Li Bowen]

Hi, 

If #+CAPTION is added, the figure will be included in the exported pdf
file twice. 

#+begin_src R :exports both :results graphics :file img.pdf
hist(rnorm(100))
#+end_src

#+CAPTION: Some description
#+RESULTS:
[[file:img.pdf]

Many thanks.

-- 
Sincerely,
Li Bowen.