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nitro_enclaves: Fix race when accessing has_event flag #585

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The has_event flag is set while holding the enclave_info_mutex mutex. Let's also hold the mutex while reading the flag to avoid races.

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The `has_event` flag is set while holding the `enclave_info_mutex`
mutex. Let's also hold the mutex while reading the flag to avoid races.

Signed-off-by: Costin Lupu <[email protected]>
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