tools/xen-cpuid: avoid producing bogus output

tools/xen-cpuid: avoid producing bogus output

I was (mistakenly, as - looking at the code - it's clearly not intended
to work) passing the tool "Raw" and "Host" as command line arguments.
Avoid printing just "Raw       " with not even a newline at the end in
such a case. Instead report what wasn't understood by the parsing logic.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Wei Liu <wl@xen.org>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Release-acked-by: Juergen Gross <jgross@suse.com>