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mdbx: fix SIGSEGV in case mdbx_env_close_ex() called without mdbx_env_open().
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@ -5387,8 +5387,9 @@ int __cold mdbx_env_close_ex(MDBX_env *env, int dont_sync) {
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if (unlikely(env->me_signature != MDBX_ME_SIGNATURE))
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return MDBX_EBADSIGN;
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if ((env->me_flags & MDBX_RDONLY) == 0) {
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if (env->me_txn0->mt_owner && env->me_txn0->mt_owner != mdbx_thread_self())
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if (env->me_lck && (env->me_flags & MDBX_RDONLY) == 0) {
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if (env->me_txn0 && env->me_txn0->mt_owner &&
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env->me_txn0->mt_owner != mdbx_thread_self())
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return MDBX_BUSY;
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if (!dont_sync)
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rc = mdbx_env_sync(env, true);
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