vfs: spread struct mount - clone_mnt/copy_tree argument

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/pnode.c b/fs/pnode.c
index efbe0c0..5d79f38 100644
--- a/fs/pnode.c
+++ b/fs/pnode.c
@@ -239,7 +239,7 @@
 
 		source =  get_source(m, prev_dest_mnt, prev_src_mnt, &type);
 
-		if (!(child = copy_tree(source, source->mnt_root, type))) {
+		if (!(child = copy_tree(real_mount(source), source->mnt_root, type))) {
 			ret = -ENOMEM;
 			list_splice(tree_list, tmp_list.prev);
 			goto out;