rxrpc: Trace call completion

Add a tracepoint to track rxrpc calls moving into the completed state and
to log the completion type and the recorded error value and abort code.

Signed-off-by: David Howells <dhowells@redhat.com>

net/rxrpc/ar-internal.h

@@ -778,6 +778,7 @@ static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
 		call->error = error;
 		call->completion = compl,
 		call->state = RXRPC_CALL_COMPLETE;
+		trace_rxrpc_call_complete(call);
 		wake_up(&call->waitq);
 		return true;
 	}