[Libvir] [PATCH] Don't access line[-1] for a zero-length "line" from fgets.

[Richard W.M. Jones]

Jim Meyering wrote:
> In reviewing the StorageAPI patches, I saw that some bogus input could
> cause a segfault.  There's similar code in libvirt.c, so this fixes both.
> Note that virsh.c does this, too, but it already has the required guard.
> 
> The src/libvirt.c patch applies to the trunk, but isn't a big
> deal, since it's in the sample AuthCallback function.
> 
> The storage_backend.c part applies to the work-in-progress
> mercurial queue, but does matter, because we have no guarantee
> what the exec'd command will output.

+1.

Rich.

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