rust: hpet: fix fw_cfg handling

HPET ids for fw_cfg are not assigned correctly, because there
is a read but no write.  This is caught by nightly Rust as
an unused-assignments warning, so fix it.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
1 file changed