net: ethernet: aquantia: Fixed missing rtnl_unlock.

rtnl_unlock should be called if error occurred.
Signed-off-by: NPavel Belous <pavel.belous@aquantia.com>
Reviewed-by: NLino Sanfilippo <LinoSanfilippo@gmx.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/aquantia/atlantic/aq_nic.c

@@ -932,7 +932,7 @@ int aq_nic_change_pm_state(struct aq_nic_s *self, pm_message_t *pm_msg)
 
 	if (!netif_running(self->ndev)) {
 		err = 0;
-		goto err_exit;
+		goto out;
 	}
 	rtnl_lock();
 	if (pm_msg->event & PM_EVENT_SLEEP || pm_msg->event & PM_EVENT_FREEZE) {
@@ -957,8 +957,9 @@ int aq_nic_change_pm_state(struct aq_nic_s *self, pm_message_t *pm_msg)
 		netif_device_attach(self->ndev);
 		netif_tx_start_all_queues(self->ndev);
 	}
-	rtnl_unlock();
 
 err_exit:
+	rtnl_unlock();
+out:
 	return err;
 }