Detach env of ci explicitly on atexit
#6288
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Supplement to commit 177deba (mruby#6276). If the ci is incomplete, the previous method may cause the application to crash because `env->stack` points to an invalid address when expanding the data stack. Since the ci is in an abnormal state, control it by putting `NULL` in `env->stack`. If the ci is fine and top-level, detach `env` as usual with `mrb_env_unshare()`.
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Supplement to commit 177deba (#6276).
If the ci is incomplete, the previous method may cause the application to crash because
env->stackpoints to an invalid address when expanding the data stack. Since the ci is in an abnormal state, control it by puttingNULLinenv->stack.If the ci is fine and top-level, detach
envas usual withmrb_env_unshare().