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Add nrf51_soc mmio read method to avoid NULL pointer dereference issue. Reported-by: Lei Sun <slei.casper@gmail.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org> Reviewed-by: Li Qiang <liq3ea@gmail.com> Message-Id: <20200811114133.672647-6-ppandit@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>