staging: fsl-dpaa2/ethsw: remove redundant pointer 'port_priv'

Pointer 'port_priv' is being assigned but is never used hence it is
redundant and can be removed.

Cleans up clang warning:
variable 'port_priv' set but not used [-Wunused-but-set-variable]
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fsl-dpaa2/ethsw/ethsw.c

@@ -1014,10 +1014,8 @@ static void ethsw_switchdev_event_work(struct work_struct *work)
 		container_of(work, struct ethsw_switchdev_event_work, work);
 	struct net_device *dev = switchdev_work->dev;
 	struct switchdev_notifier_fdb_info *fdb_info;
-	struct ethsw_port_priv *port_priv;
 
 	rtnl_lock();
-	port_priv = netdev_priv(dev);
 	fdb_info = &switchdev_work->fdb_info;
 
 	switch (switchdev_work->event) {