Handle memory allocation failure properly, allow to override SIZE, fix declaration compatability.#27

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zhubr wants to merge 2 commits intossvb:masterfrom

Commits on Jun 6, 2021

Handle memory allocation failure properly, allow to override SIZE (mostly needed for smaller devices), fix declaration syntax for older compilers.
zhubr
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Allow to override LATBENCH_COUNT on command line (mostly needed for slow devices).
zhubr
committed