Cleanup after commit 585d3bc06f4ca57f975a5a1f698f65a45ea66225

fsync_bdev() export and a bunch of stubs for !CONFIG_BLOCK case had
been left behind

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 8c3c689..f45dbc1 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -204,6 +204,7 @@
 	}
 	return sync_blockdev(bdev);
 }
+EXPORT_SYMBOL(fsync_bdev);
 
 /**
  * freeze_bdev  --  lock a filesystem and force it into a consistent state