rxrpc: Fix handling of connection failure in client call creation

If rxrpc_connect_call() fails during the creation of a client connection,
there are two bugs that we can hit that need fixing:

 (1) The call state should be moved to RXRPC_CALL_DEAD before the call
     cleanup phase is invoked.  If not, this can cause an assertion failure
     later.

 (2) call->link should be reinitialised after being deleted in
     rxrpc_new_client_call() - which otherwise leads to a failure later
     when the call cleanup attempts to delete the link again.
Signed-off-by: David Howells <dhowells@redhat.com>

net/rxrpc/call_object.c

@@ -425,9 +425,10 @@ struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 	rxrpc_put_call(call);
 
 	write_lock_bh(&rxrpc_call_lock);
-	list_del(&call->link);
+	list_del_init(&call->link);
 	write_unlock_bh(&rxrpc_call_lock);
 
+	call->state = RXRPC_CALL_DEAD;
 	rxrpc_put_call(call);
 	_leave(" = %d", ret);
 	return ERR_PTR(ret);
@@ -439,6 +440,7 @@ struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 	 */
 found_user_ID_now_present:
 	write_unlock(&rx->call_lock);
+	call->state = RXRPC_CALL_DEAD;
 	rxrpc_put_call(call);
 	_leave(" = -EEXIST [%p]", call);
 	return ERR_PTR(-EEXIST);