FAPI: Fix usage of endorsement handle #1750

Job	Run time
scanbuild	6m 25s
test-coverage	5m 5s
build-test (ubuntu-18.04, gcc)	4m 40s
coverity-test	0s
build-test (ubuntu-18.04, clang)	5m 7s
test-fuzz	2m 28s
test-mbedtls (ubuntu-20.04)	2m 50s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 48s
test-no-crypto-build	1m 18s
build-test (ubuntu-20.04, gcc)	5m 4s
test-tcti-config	13m 46s
build-test (ubuntu-20.04, clang)	4m 40s
build-test (fedora-32, gcc)	5m 24s
build-test (fedora-32, clang)	5m 25s
build-test (opensuse-leap, gcc)	4m 50s
build-test (opensuse-leap, clang)	4m 56s
build-test (ubuntu-22.04, gcc)	5m 32s
build-test (ubuntu-22.04, clang)	5m 39s
build-test (alpine-3.15, gcc)	4m 15s
build-test (alpine-3.15, clang)	5m 20s
	1h 35m 32s

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