rxrpc: Use call->peer rather than going to the connection

Use call->peer rather than call->conn->params.peer as call->conn may become
NULL.
Signed-off-by: NDavid Howells <dhowells@redhat.com>

net/rxrpc/call_event.c

@@ -551,7 +551,7 @@ static void rxrpc_extract_ackinfo(struct rxrpc_call *call, struct sk_buff *skb,
 
 	mtu = min(ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU));
 
-	peer = call->conn->params.peer;
+	peer = call->peer;
 	if (mtu < peer->maxdata) {
 		spin_lock_bh(&peer->lock);
 		peer->maxdata = mtu;
@@ -843,8 +843,8 @@ void rxrpc_process_call(struct work_struct *work)
 
 	/* there's a good chance we're going to have to send a message, so set
 	 * one up in advance */
-	msg.msg_name	= &call->conn->params.peer->srx.transport;
-	msg.msg_namelen	= call->conn->params.peer->srx.transport_len;
+	msg.msg_name	= &call->peer->srx.transport;
+	msg.msg_namelen	= call->peer->srx.transport_len;
 	msg.msg_control	= NULL;
 	msg.msg_controllen = 0;
 	msg.msg_flags	= 0;
@@ -1151,8 +1151,8 @@ void rxrpc_process_call(struct work_struct *work)
 send_ACK_with_skew:
 	ack.maxSkew = htons(call->ackr_skew);
 send_ACK:
-	mtu = call->conn->params.peer->if_mtu;
-	mtu -= call->conn->params.peer->hdrsize;
+	mtu = call->peer->if_mtu;
+	mtu -= call->peer->hdrsize;
 	ackinfo.maxMTU	= htonl(mtu);
 	ackinfo.rwind	= htonl(rxrpc_rx_window_size);