[PATCH 2/2] UBIFS: add a log overlap assertion

[hujianyang]

> 
> Would you please re-send your patch with proper commit message, etc, so
> that I could 'git am' it. This time I'd like to apply a patch which has
> been tested. Thanks!
>

I've tested this patch and resend it.

I don't think you can just am it because you know, I'm not very
good at English. So I think you should change some comments as
before. Sorry for that, and thanks for your help these days.

I'd like to improve my English but it needs some time. -.-