ethernet: ldmvsw: mark ldmvsw_open() static

The function is exported for no reason and should just be static:

drivers/net/ethernet/sun/ldmvsw.c:127:5: error: no previous prototype for 'ldmvsw_open' [-Werror=missing-prototypes]
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Simon Horman <horms@kernel.org> # build-tested
Link: https://lore.kernel.org/r/20230810122528.1220434-1-arnd@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/sun/ldmvsw.c

@@ -124,7 +124,7 @@ static void vsw_set_rx_mode(struct net_device *dev)
 	return sunvnet_set_rx_mode_common(dev, port->vp);
 }
 
-int ldmvsw_open(struct net_device *dev)
+static int ldmvsw_open(struct net_device *dev)
 {
 	struct vnet_port *port = netdev_priv(dev);
 	struct vio_driver_state *vio = &port->vio;
@@ -136,7 +136,6 @@ int ldmvsw_open(struct net_device *dev)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(ldmvsw_open);
 
 #ifdef CONFIG_NET_POLL_CONTROLLER
 static void vsw_poll_controller(struct net_device *dev)