fio.h: Fix TD_DDIR_RANDWRITE

A typeo had set DDIR_RANDWRITE to be "WRITE | READ" instead of
"WRITE | RAND".  Correct it.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.h b/fio.h
index faa0cfb..9b8bed7 100644
--- a/fio.h
+++ b/fio.h
@@ -34,7 +34,7 @@
 	TD_DDIR_RAND		= 1 << 2,
 	TD_DDIR_RW		= TD_DDIR_READ | TD_DDIR_WRITE,
 	TD_DDIR_RANDREAD	= TD_DDIR_READ | TD_DDIR_RAND,
-	TD_DDIR_RANDWRITE	= TD_DDIR_WRITE | TD_DDIR_READ,
+	TD_DDIR_RANDWRITE	= TD_DDIR_WRITE | TD_DDIR_RAND,
 	TD_DDIR_RANDRW		= TD_DDIR_RW | TD_DDIR_RAND,
 };