I used the clang-tidy qemu-round check to generate the fix:
https://github.com/elmarco/clang-tools-extra

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
---
 block/qcow2-cluster.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index f06c08f64c..30db942dde 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -61,7 +61,7 @@ int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,
             new_l1_size = 1;
         }
         while (min_size > new_l1_size) {
-            new_l1_size = (new_l1_size * 3 + 1) / 2;
+            new_l1_size = DIV_ROUND_UP(new_l1_size * 3, 2);
         }
     }
 
-- 
2.14.1.146.gd35faa819