CONNECTOR: make cn_already_initialized static

It is used in connector.c only, so make it static.
Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/connector/connector.c

@@ -47,7 +47,7 @@ static LIST_HEAD(notify_list);
 
 static struct cn_dev cdev;
 
-int cn_already_initialized = 0;
+static int cn_already_initialized;
 
 /*
  * msg->seq and msg->ack are used to determine message genealogy.

include/linux/connector.h

@@ -170,7 +170,5 @@ int cn_cb_equal(struct cb_id *, struct cb_id *);
 
 void cn_queue_wrapper(struct work_struct *work);
 
-extern int cn_already_initialized;
-
 #endif				/* __KERNEL__ */
 #endif				/* __CONNECTOR_H */