qcow1: Fix qcow_aio_writev

Pass is_write = 1 to qcow_aio_setup when writing.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

block/qcow.c

diff --git a/block/qcow.c b/block/qcow.c
index 55a68a6..7fc85ae 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -723,7 +723,7 @@
 
     s->cluster_cache_offset = -1; /* disable compressed cache */
 
-    acb = qcow_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
+    acb = qcow_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
     if (!acb)
         return NULL;