[yocto] Correct procedure for rebuilding after a git pull

[Khem Raj]

On Wed, Oct 3, 2012 at 6:42 AM, Jack Mitchell <ml at communistcode.co.uk> wrote:
>
> I'll bear that in mind.
>

that will help a lot in fixing sstate

> I believe it was ext2fs that failed earlier today on my production build
> machine. Again a -c cleansstate fixed it and I didn't investigate so I can't
> add anything else!

cleansstate was a stop gap but should be avoided as much as possible.