fixup! byte compile errors

Author: yuhan0

cider-connection.el

@@ -296,6 +296,7 @@ message in the REPL area."
   (cider-nrepl-send-request '("op" "out-subscribe")
                             (cider-interactive-eval-handler (current-buffer))))
 
+(defvar cider-mode)
 (declare-function cider-mode "cider-mode")
 (defun cider-enable-on-existing-clojure-buffers ()
   "Enable CIDER's minor mode on existing Clojure buffers.