can: purge socket error queue on sock destruct

commit fd704bd5 upstream.

CAN supports software tx timestamps as of the below commit. Purge
any queued timestamp packets on socket destroy.

Fixes: 51f31cab ("ip: support for TX timestamps on UDP and RAW sockets")
Reported-by:  <syzbot+a90604060cb40f5bdd16@syzkaller.appspotmail.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

net/can/af_can.c

@@ -114,6 +114,7 @@ EXPORT_SYMBOL(can_ioctl);
 static void can_sock_destruct(struct sock *sk)
 {
 	skb_queue_purge(&sk->sk_receive_queue);
+	skb_queue_purge(&sk->sk_error_queue);
 }
 
 static const struct can_proto *can_get_proto(int protocol)