cmd/lncli: close sendpayment stream after recv

We now close the send payment stream after receiving a response.
Otherwise if the RPC server is asynchronously handling requests then,
closing the stream would result in the server returning an EOF error,
terminating the request.

cmd/lncli/commands.go

@@ -491,13 +491,14 @@ func sendPaymentCommand(ctx *cli.Context) error {
 	if err := paymentStream.Send(req); err != nil {
 		return err
 	}
-	paymentStream.CloseSend()
 
 	resp, err := paymentStream.Recv()
 	if err != nil {
 		return err
 	}
 
+	paymentStream.CloseSend()
+
 	printRespJson(resp)
 
 	return nil