pass default dentry_operations to mount_pseudo()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 771f235..88da703 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -473,7 +473,7 @@
 static struct dentry *bd_mount(struct file_system_type *fs_type,
 	int flags, const char *dev_name, void *data)
 {
-	return mount_pseudo(fs_type, "bdev:", &bdev_sops, 0x62646576);
+	return mount_pseudo(fs_type, "bdev:", &bdev_sops, NULL, 0x62646576);
 }
 
 static struct file_system_type bd_type = {