[PATCH] Update ioengine help text

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/init.c b/init.c
index badd635..36c1839 100644
--- a/init.c
+++ b/init.c
@@ -848,7 +848,7 @@
 	if (td->io_ops)
 		return 0;
 
-	log_err("fio: ioengine: { linuxaio, aio, libaio }, posixaio, sync, mmap, sgio, splice, cpu\n");
+	log_err("fio: ioengine= libaio, posixaio, sync, mmap, sgio, splice, cpu, null\n");
 	log_err("fio: or specify path to dynamic ioengine module\n");
 	return 1;
 }