arch: arm: aarch32: cortex-m: fix logic for detecting guard violation
arch: arm: aarch32: cortex-m: fix logic for detecting guard violation

We fix (by inverting) the logic of the IS_MPU_GUARD_VIOLATION
macro, with respect to the value of the supplied 'fault_addr'.
We shall only be inspecting the fault_addr value if it is not
set to -EINVAL.

Signed-off-by: Ioannis Glaropoulos <5921cc8bab7e1d4329f52fd8f6268f9692e3de80@nordicsemi.no>

finikorg/zephyr,nashif/zephyr,Vudentz/zephyr,galak/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,Vudentz/zephyr,finikorg/zephyr,galak/zephyr,Vudentz/zephyr,nashif/zephyr,finikorg/zephyr,finikorg/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr