net/can/mscan: fix function annotations

- use extern where apropriate
- don't export symbols
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/can/mscan/mscan.c

@@ -611,7 +611,6 @@ int register_mscandev(struct net_device *dev, int clock_src)
 
 	return register_candev(dev);
 }
-EXPORT_SYMBOL_GPL(register_mscandev);
 
 void unregister_mscandev(struct net_device *dev)
 {
@@ -621,7 +620,6 @@ void unregister_mscandev(struct net_device *dev)
 	clrbits8(&regs->canctl1, MSCAN_CANE);
 	unregister_candev(dev);
 }
-EXPORT_SYMBOL_GPL(unregister_mscandev);
 
 struct net_device *alloc_mscandev(void)
 {
@@ -651,7 +649,6 @@ struct net_device *alloc_mscandev(void)
 
 	return dev;
 }
-EXPORT_SYMBOL_GPL(alloc_mscandev);
 
 MODULE_AUTHOR("Andrey Volkov <avolkov@varma-el.com>");
 MODULE_LICENSE("GPL v2");

drivers/net/can/mscan/mscan.h

@@ -279,7 +279,7 @@ struct mscan_priv {
 	struct napi_struct napi;
 };
 
-struct net_device *alloc_mscandev(void);
+extern struct net_device *alloc_mscandev(void);
 /*
  * clock_src:
  *	1 = The MSCAN clock source is the onchip Bus Clock.