Fold the code for freeing env - #6232
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Also, `e->stack = NULL` is not needed. This is because "use-after-free" can be detected with `MRB_DEBUG` + `MRB_GC_STRESS`.
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Also,
e->stack = NULLis not needed.This is because "use-after-free" can be detected with
MRB_DEBUG+MRB_GC_STRESS.