greybus: operation: drop OOM-response FIXME

Drop FIXME about sending responses in OOM situations.

If we fail to allocate an operation for an incoming request, we have
bigger problems than to worry about sending a response.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/operation.c

@@ -828,7 +828,7 @@ static void gb_connection_recv_request(struct gb_connection *connection,
 						type, data, size);
 	if (!operation) {
 		dev_err(&connection->dev, "can't create operation\n");
-		return;		/* XXX Respond with pre-allocated ENOMEM */
+		return;
 	}
 
 	ret = gb_operation_get_active(operation);