net: dsa: unexport dsa_dev_to_net_device()

dsa.o and dsa2.o are linked into the same dsa_core.o, there is no reason
to export this symbol when its only caller is local.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/dsa.h

@@ -1285,8 +1285,6 @@ struct dsa_switch_driver {
 	const struct dsa_switch_ops *ops;
 };
 
-struct net_device *dsa_dev_to_net_device(struct device *dev);
-
 bool dsa_fdb_present_in_other_db(struct dsa_switch *ds, int port,
 				 const unsigned char *addr, u16 vid,
 				 struct dsa_db db);

net/dsa/dsa.c

@@ -182,7 +182,6 @@ struct net_device *dsa_dev_to_net_device(struct device *dev)
 
 	return NULL;
 }
-EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);
 
 /* Determine if we should defer delivery of skb until we have a rx timestamp.
  *

net/dsa/dsa_priv.h

@@ -247,6 +247,8 @@ const struct dsa_device_ops *dsa_tag_driver_get_by_id(int tag_protocol);
 const struct dsa_device_ops *dsa_tag_driver_get_by_name(const char *name);
 void dsa_tag_driver_put(const struct dsa_device_ops *ops);
 
+struct net_device *dsa_dev_to_net_device(struct device *dev);
+
 bool dsa_db_equal(const struct dsa_db *a, const struct dsa_db *b);
 
 bool dsa_schedule_work(struct work_struct *work);