KVM: x86/xen: Remove unneeded semicolon

The semicolon after the "}" is unneeded.

Signed-off-by: zhang songyi <zhang.songyi@zte.com.cn>
Link: https://lore.kernel.org/r/202212191432274558936@zte.com.cn


Signed-off-by: Sean Christopherson <seanjc@google.com>