Re: sha1_to_hex() usage cleanup

> Somebody on the #git channel complained that the sha1_to_hex() thing uses 
> a static buffer which caused an error message to show the same hex output 
> twice instead of showing two different ones.
>
> That's pretty easily rectified by making it uses a simple LRU of a few 
> buffers, which also allows some other users (that were aware of the buffer 
> re-use) to be written in a more straightforward manner.
>
> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
> ---
>
> This is another throw-away patch of mine. Not a big deal, but since I 
> tried it, I might as well try to submit it and see if Junio agrees..