[libvirt] [PATCH] Fix safezero()

[Jiri Denemark]

> > Various safezero() implementations used either -1, errno or -errno
> > return values. This patch fixes them all to return -1 and set errno
> > appropriately.
> > 
> > There was also a bug in size parameter passed to safewrite() which could
> > result in an attempt to write gigabytes out of a megabyte buffer.
> 
>   ACK, this is bug fix from my viewpoint, so I'm fine pushing this now,

OK, pushed.

Jirka