ocfs2: Reserve 1 more cluster in expanding_inline_dir for indexed dir.

In ocfs2_expand_inline_dir, we calculate whether we need 1 extra
cluster if we can't store the dx inline the root and save it in
dx_alloc. So add it when we call ocfs2_reserve_clusters.
Signed-off-by: NTao Ma <tao.ma@oracle.com>
Signed-off-by: NMark Fasheh <mfasheh@suse.com>

fs/ocfs2/dir.c

@@ -2934,7 +2934,7 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
 	 */
 	BUG_ON(alloc > 2);
 
-	ret = ocfs2_reserve_clusters(osb, alloc, &data_ac);
+	ret = ocfs2_reserve_clusters(osb, alloc + dx_alloc, &data_ac);
 	if (ret) {
 		mlog_errno(ret);
 		goto out;