during my split of cpus.c, code line
"current_cpu = cpu"
was removed by mistake, causing hax to break.

This commit fixes the situation restoring it.

Reported-by: Volker Rümelin <vr_qemu@t-online.de>
Fixes: e92558e4
Signed-off-by: Claudio Fontana <cfontana@suse.de>
Message-Id: <20201016080032.13914-1-cfontana@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>