misc: zynq-xadc: Fix off-by-one This bounds check was off-by-one. Fix. Reported-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Peter Crosthwaite <crosthwaite.peter@gmail.com> Message-id: 1453101737-11255-1-git-send-email-crosthwaite.peter@gmail.com Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>