btrfs: sink blocksize parameter to readahead_tree_block

All callers pass nodesize.

Signed-off-by: David Sterba <dsterba@suse.cz>
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 74257d6..cb5d446 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -2965,8 +2965,7 @@
 	while (rb_node) {
 		block = rb_entry(rb_node, struct tree_block, rb_node);
 		if (!block->key_ready)
-			readahead_tree_block(rc->extent_root, block->bytenr,
-					block->key.objectid);
+			readahead_tree_block(rc->extent_root, block->bytenr);
 		rb_node = rb_next(rb_node);
 	}