reactor, linux-aio: clean up `smp::adjust_max_networking_aio_io_control_blocks` #876

Job	Run time
Test (clang++, C++20, debug) / test	13m 28s
Test with DPDK enabled / test	18m 33s
Test (clang++, C++20, dev) / test	11m 26s
Test with C++20 modules enabled / test	11m 24s
Test (clang++, C++20, release) / test	11m 55s
Test (clang++, C++23, debug) / test	12m 53s
Test (clang++, C++23, release) / test	15m 49s
Test (clang++, C++23, dev) / test	11m 22s
Test (g++, C++20, debug) / test	16m 31s
Test (g++, C++20, dev) / test	9m 17s
Test (g++, C++23, debug) / test	17m 39s
Test (g++, C++20, release) / test	14m 22s
Test (g++, C++23, dev) / test	9m 27s
Test (g++, C++23, release) / test	14m 1s
	3h 8m 7s

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