t7900: fix typo: "test_execpt_success"

Signed-off-by: Josh Steadmon <steadmon@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t7900-maintenance.sh

@@ -441,7 +441,7 @@ test_expect_success 'register preserves existing strategy' '
 	test_config maintenance.strategy incremental
 '
 
-test_execpt_success 'fails when running outside of a repository' '
+test_expect_success 'fails when running outside of a repository' '
 	nongit test_must_fail git maintenance run &&
 	nongit test_must_fail git maintenance stop &&
 	nongit test_must_fail git maintenance start &&