rxrpc: uninitialized variable in rxrpc_send_ack_packet()

The "pkt" was supposed to have been deleted in a previous patch.  It
leads to an uninitialized variable bug.

Fixes: 72f0c6fb ("rxrpc: Allocate ACK records at proposal and queue for transmission")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/rxrpc/output.c

@@ -202,7 +202,6 @@ static void rxrpc_cancel_rtt_probe(struct rxrpc_call *call,
 static int rxrpc_send_ack_packet(struct rxrpc_local *local, struct rxrpc_txbuf *txb)
 {
 	struct rxrpc_connection *conn;
-	struct rxrpc_ack_buffer *pkt;
 	struct rxrpc_call *call = txb->call;
 	struct msghdr msg;
 	struct kvec iov[1];
@@ -270,7 +269,6 @@ static int rxrpc_send_ack_packet(struct rxrpc_local *local, struct rxrpc_txbuf *
 		rxrpc_set_keepalive(call);
 	}
 
-	kfree(pkt);
 	return ret;
 }