qom: allow casting of a NULL class

[qemu.git] / block / cow.c

diff --git a/block/cow.c b/block/cow.c
index d73e08cf92f891d22d099bd79cf4584d8034fa0a..9f94599661c5cc8280e1558277cf5315d7f4e66c 100644 (file)
--- a/block/cow.c
+++ b/block/cow.c
@@ -279,7 +279,7 @@ static int cow_create(const char *filename, QEMUOptionParameter *options)
         return ret;
     }
 
-    ret = bdrv_file_open(&cow_bs, filename, BDRV_O_RDWR);
+    ret = bdrv_file_open(&cow_bs, filename, NULL, BDRV_O_RDWR);
     if (ret < 0) {
         return ret;
     }