greybus: operation: suppress response submission on connection tear down

Suppress response submission on connection tear down as we do with
requests.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/operation.c

@@ -705,6 +705,9 @@ static int gb_operation_response_send(struct gb_operation *operation,
 	struct gb_connection *connection = operation->connection;
 	int ret;
 
+	if (connection->state != GB_CONNECTION_STATE_ENABLED)
+		return -ENOTCONN;
+
 	if (!operation->response &&
 			!gb_operation_is_unidirectional(operation)) {
 		if (!gb_operation_response_alloc(operation, 0))