[riot-notifications] [RIOT-OS/RIOT] sys/atomic_utils: Use volatile qualifier (#15465)

[Marian Buschsieweke]

@maribu commented on this pull request.



> -        /* var can be register allocated, hence the memory barrier of          \
-         * irq_disable() and irq_restore() may not apply here. Using volatile  \
-         * ensures that the compiler allocates it in memory and that the       \
-         * memory access is not optimized out. */                              \
-        type result = *((const volatile type *)var);                           \

Maybe I should have done this right from the beginning just for this simplification.

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