[FFmpeg-cvslog] lzo: fix memcpy_backptr() with 0 offset

[Reimar Döffinger]

On Sat, Dec 24, 2011 at 09:27:28PM +0100, Reimar Döffinger wrote:
> On Sat, Dec 24, 2011 at 06:53:09PM +0100, Michael Niedermayer wrote:
> > ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Sat Dec 24 03:55:58 2011 +0100| [58c41799ab6b52df86b6afe23304f34b62741326] | committer: Michael Niedermayer
> > 
> > lzo: fix memcpy_backptr() with 0 offset
> 
> Uh, could you explain why you believe something is broken with 0 offset?
> Except for a few useless read/writes the result is that nothing changes
> both before your commit and after your commit, so it seems to me it adds
> a completely pointless branch.

Ah, I see it would hang. However a value of 0 makes no sense anyway,
what code uses this?
If you just don't like the potential hang without caring about what
actually happens, changing the "back == 1"  to "back <= 1" would be
more efficient.