qcow2: Make sure to return an error when L2 table loading fails

This was suggested by Kevin Wolf since this is, in fact, an error condition.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5007 c046a42c-6fe2-441c-8c8c-71466251a162

block-qcow2.c

@@ -669,7 +669,7 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
     l2_offset &= ~QCOW_OFLAG_COPIED;
     l2_table = l2_load(bs, l2_offset);
     if (l2_table == NULL)
-        goto out;
+        return 0;
 
     /* find the cluster offset for the given disk offset */