btrfs: sink blocksize parameter to reada_tree_block_flagged

Signed-off-by: David Sterba <dsterba@suse.cz>
diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index 5c3fde6..4d3d4e5 100644
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -721,7 +721,7 @@
 
 	atomic_inc(&dev->reada_in_flight);
 	ret = reada_tree_block_flagged(fs_info->extent_root, logical,
-			fs_info->tree_root->nodesize, mirror_num, &eb);
+			mirror_num, &eb);
 	if (ret)
 		__readahead_hook(fs_info->extent_root, NULL, logical, ret);
 	else if (eb)