staging: dpaa2-ethsw: fix switch/case fallthrough warning

Fix the fallthrough warning that is reported by checkpatch.
Signed-off-by: Marian Posteuca <posteuca@mutex.one>
Link: https://lore.kernel.org/r/20200720064205.10323-1-posteuca@mutex.oneSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

@@ -1362,7 +1362,7 @@ static int port_switchdev_blocking_event(struct notifier_block *unused,
 		return NOTIFY_DONE;
 
 	switch (event) {
-	case SWITCHDEV_PORT_OBJ_ADD: /* fall through */
+	case SWITCHDEV_PORT_OBJ_ADD:
 	case SWITCHDEV_PORT_OBJ_DEL:
 		return ethsw_switchdev_port_obj_event(event, dev, ptr);
 	case SWITCHDEV_PORT_ATTR_SET: