crypto: Use O_CLOEXEC in qcrypto_random_init
Avoids leaking the /dev/urandom fd into any child processes. Reviewed-by: NLaurent Vivier <lvivier@redhat.com> Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com> Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
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