tpm2_eventlog: fix typo #1857

Job	Run time
coverity-test	0s
build-test (ubuntu-20.04, gcc)	5m 51s
coverage-test	6m 22s
build-test (ubuntu-20.04, clang)	5m 8s
build-test (fedora-30, gcc)	5m 52s
build-test (fedora-30, clang)	5m 21s
master-tss-build-test (gcc)	17m 39s
build-test (opensuse-leap, gcc)	6m 0s
master-tss-build-test (clang)	4m 48s
build-test (opensuse-leap, clang)	5m 15s
build-test (fedora-32, gcc)	5m 50s
build-test (fedora-32, clang)	5m 7s
build-test (ubuntu-22.04, gcc)	11m 24s
build-test (ubuntu-22.04, clang)	10m 53s
	1h 35m 30s

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