[AF_RXRPC]: Add a missing goto

Add a missing goto to error handling in the RXKAD security module for
AF_RXRPC.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/rxrpc/rxkad.c

@@ -1021,6 +1021,7 @@ static int rxkad_verify_response(struct rxrpc_connection *conn,
 
 	abort_code = RXKADINCONSISTENCY;
 	if (version != RXKAD_VERSION)
+		goto protocol_error;
 
 	abort_code = RXKADTICKETLEN;
 	if (ticket_len < 4 || ticket_len > MAXKRB5TICKETLEN)