[Libvir] fix misleading indentation

[Jim Meyering <jim meyering net>]

Here's a tiny patch to fix indentation,
since I'm about to change the code in that area,
I'm submitting this first, so we don't mix syntax-only
changes with ones that change semantics.

The last two times I tried to send an attachment,
mailman removed them.  I'll try one more time, with this one: