Auth file: Ensure 0-termination #19

Job	Run time
master-tss-build-test (gcc)	5m 45s
coverity-test	0s
build-test (ubuntu-18.04, gcc)	5m 40s
master-tss-build-test (clang)	5m 2s
coverage-test	5m 47s
build-test (ubuntu-18.04, clang)	5m 11s
build-test (ubuntu-20.04, gcc)	5m 49s
build-test (ubuntu-20.04, clang)	4m 55s
build-test (fedora-30, gcc)	5m 58s
build-test (fedora-30, clang)	5m 26s
build-test (opensuse-leap, gcc)	6m 3s
build-test (opensuse-leap, clang)	5m 7s
build-test (fedora-32, gcc)	5m 51s
build-test (fedora-32, clang)	5m 9s
build-test (ubuntu-22.04, gcc)	11m 14s
build-test (ubuntu-22.04, clang)	10m 40s
	1h 33m 37s

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