[PATCH] org-src.el Do not ask to revert unmodified buffers

[pillule]

Hi, it is asked to the user if we want to revert changes when 
re-entering in a org-source buffer.
Even if the buffer have no modifications.

This patch ask to revert the buffer only if there are 
modifications to the source buffer.

@@ -493,8 +493,9 @@
         (old-edit-buffer (org-src--edit-buffer beg end))
         (contents (or contents (nth 2 area))))
    (if (and old-edit-buffer
-            (or (not org-src-ask-before-returning-to-edit-buffer)
-		 (y-or-n-p "Return to existing edit buffer ([n] will 
         revert changes)? ")))
+         (or (not org-src-ask-before-returning-to-edit-buffer)
+            (or (not (buffer-modified-p old-edit-buffer))
+		(y-or-n-p "Return to existing edit buffer ([n] will revert 
changes)? "))))
        ;; Move to existing buffer.
        (org-src-switch-to-buffer old-edit-buffer 'return)
      ;; Discard old edit buffer.

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