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tests/qtest/bios-tables-test: Check for dup2() failure
Coverity notes that we don't check for dup2() failing. Add some assertions so that if it does ever happen we get some indication. (This is similar to how we handle other "don't expect this syscall to fail" checks in this test code.) Fixes: Coverity CID 1432346 Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Stefan Berger <stefanb@linux.ibm.com> Message-id: 20210525134458.6675-2-peter.maydell@linaro.org
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