btrfs: qgroup: update limit info in function btrfs_run_qgroups().

When we commit_transaction(), qgroups in btree should be updated.
But, limit info is not considered currently. It will cause a problem
when a qgroup of a snapshot inherit the limit info from srcqgroup,
then there is an inconsistency.

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>

fs/btrfs/qgroup.c

@@ -2151,6 +2151,10 @@ int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
 		list_del_init(&qgroup->dirty);
 		spin_unlock(&fs_info->qgroup_lock);
 		ret = update_qgroup_info_item(trans, quota_root, qgroup);
+		if (ret)
+			fs_info->qgroup_flags |=
+					BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
+		ret = update_qgroup_limit_item(trans, quota_root, qgroup);
 		if (ret)
 			fs_info->qgroup_flags |=
 					BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;