Adapt API style of lock_memory to match the one of the other functions #518

Job	Run time
binary (humble, main) / humble main	3m 13s
binary (humble, testing) / humble testing	3m 21s
binary (jazzy, main) / jazzy main	3m 12s
binary (jazzy, testing) / jazzy testing	3m 30s
binary (rolling, main) / rolling main	3m 13s
binary (rolling, testing) / rolling testing	3m 35s
	20m 4s

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