block: Drop redundant bdrv_refresh_limits

The above bdrv_set_backing_hd already does this.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/block.c b/block.c
index aa9b5ab..a517d72 100644
--- a/block.c
+++ b/block.c
@@ -1182,9 +1182,6 @@
     }
     bdrv_set_backing_hd(bs, backing_hd);
 
-    /* Recalculate the BlockLimits with the backing file */
-    bdrv_refresh_limits(bs);
-
 free_exit:
     g_free(backing_filename);
     return ret;