t4017 (diff-retval): replace manual exit code check with test_expect_code
This commit takes advantage of Ævar Arnfjörð Bjarmason's recent change to test_expect_code (test-lib: make test_expect_code a test command) to simplify several testcases. Reviewed-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NElijah Newren <newren@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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