(defun ediff-janitor (ask keep-variants)
"Kill buffers A, B, and, possibly, C, if these buffers aren't modified.
In merge jobs, buffer C is not deleted here, but rather according to
-ediff-quit-merge-hook.
+`ediff-quit-merge-hook'.
ASK non-nil means ask the user whether to keep each unmodified buffer, unless
KEEP-VARIANTS is non-nil, in which case buffers are never killed.
A side effect of cleaning up may be that you should be careful when comparing