befs: switch to ->iterate_shared()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/befs/linuxvfs.c

@@ -66,7 +66,7 @@ static struct kmem_cache *befs_inode_cachep;
 
 static const struct file_operations befs_dir_operations = {
 	.read		= generic_read_dir,
-	.iterate	= befs_readdir,
+	.iterate_shared	= befs_readdir,
 	.llseek		= generic_file_llseek,
 };