can: cc770: Fix use after free in cc770_tx_interrupt()

This fixes use after free introduced by the last cc770 patch.

Signed-off-by: Andri Yngvason <[email protected]>
Fixes: 7462012 ("can: cc770: Fix queue stall & dropped RTR reply")
Cc: linux-stable <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>

Author: Andri Yngvason

drivers/net/can/cc770/cc770.c

@@ -706,13 +706,12 @@ static void cc770_tx_interrupt(struct net_device *dev, unsigned int o)
 		return;
 	}
 
-	can_put_echo_skb(priv->tx_skb, dev, 0);
-	can_get_echo_skb(dev, 0);
-
 	cf = (struct can_frame *)priv->tx_skb->data;
 	stats->tx_bytes += cf->can_dlc;
 	stats->tx_packets++;
 
+	can_put_echo_skb(priv->tx_skb, dev, 0);
+	can_get_echo_skb(dev, 0);
 	priv->tx_skb = NULL;
 
 	netif_wake_queue(dev);