libvirt: add type annotations to improve safety
libvirt: add type annotations to improve safety

let _ = ... is a bit dangerous if we need the side-effects of ...

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@citrix.com>

thomassa/xenopsd,koushikcgit/xenopsd,cheng--zhang/xenopsd,johnelse/xenopsd,djs55/xenopsd,thomassa/xenopsd,euanh/xenopsd,djs55/xenopsd,johnelse/xenopsd,thomassa/xenopsd,koushikcgit/xenopsd,euanh/xenopsd,euanh/xenopsd,koushikcgit/xenopsd,cheng--zhang/xenopsd,djs55/xenopsd,cheng--zhang/xenopsd,johnelse/xenopsd