qcow2: remove common from QCowAIOCB

Signed-off-by: Frediano Ziglio <freddy77@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block/qcow2.c

diff --git a/block/qcow2.c b/block/qcow2.c
index 22da050..fdb4140 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -377,7 +377,7 @@
 }
 
 typedef struct QCowAIOCB {
-    BlockDriverAIOCB common;
+    BlockDriverState *bs;
     int64_t sector_num;
     QEMUIOVector *qiov;
     int remaining_sectors;
@@ -392,7 +392,7 @@
  */
 static int qcow2_aio_read_cb(QCowAIOCB *acb)
 {
-    BlockDriverState *bs = acb->common.bs;
+    BlockDriverState *bs = acb->bs;
     BDRVQcowState *s = bs->opaque;
     int index_in_cluster, n1;
     int ret;
@@ -508,7 +508,7 @@
                                   void *opaque, QCowAIOCB *acb)
 {
     memset(acb, 0, sizeof(*acb));
-    acb->common.bs = bs;
+    acb->bs = bs;
     acb->sector_num = sector_num;
     acb->qiov = qiov;
 
@@ -560,7 +560,7 @@
  */
 static int qcow2_aio_write_cb(QCowAIOCB *acb)
 {
-    BlockDriverState *bs = acb->common.bs;
+    BlockDriverState *bs = acb->bs;
     BDRVQcowState *s = bs->opaque;
     int index_in_cluster;
     int n_end;