This test assumes capability_list_length() is an invalid cap number, but that isn't true if the running kernel supports more caps than we were compiled with, which results in the test failing. Instead use cap_last_cap() + 1. If cap_last_cap() is 63, there are no more 'invalid' cap numbers to test with, so the invalid cap number test part is skipped. (cherry picked from commit ebc815cd1c647faa934a446ceea91ff4bc9dffa4)
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