Re: [Libvirt-cim] [PATCH 1 of 2] HostSystem: check if input ref is valid

I totally forgot this when I brought up the function declaration, but the calls (this one and I think two more here; not sure about other files) should probably be changed as well. Using 0 and 1 will work exactly the same, since that's literally what true and false get defined to by stdbool, but for readability 0 and 1 should be replaced with false and true, respectively. Sorry for not catching that earlier.