Issue #4027: unify comment and modify return value in freeMemoryIfNeeded().
It looks safer to return C_OK from freeMemoryIfNeeded() when clients are paused because returning C_ERR may prevent success of writes. It is possible that there is no difference in practice since clients cannot execute writes while clients are paused, but it looks more correct this way, at least conceptually. Related to PR #4028.
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