FAPI: Fix usage of endorsement handle #1781

Job	Run time
scanbuild	6m 37s
build-test (ubuntu-18.04, gcc)	4m 40s
build-test (ubuntu-18.04, clang)	5m 15s
test-mbedtls (ubuntu-20.04)	2m 49s
build-test (ubuntu-20.04, gcc)	4m 58s
test-tcti-config	14m 0s
build-test (ubuntu-20.04, clang)	4m 59s
build-test (fedora-32, gcc)	5m 15s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 42s
build-test (fedora-32, clang)	5m 25s
test-coverage	5m 7s
build-test (opensuse-leap, gcc)	5m 16s
build-test (opensuse-leap, clang)	5m 3s
test-fuzz	2m 38s
build-test (ubuntu-22.04, gcc)	5m 43s
build-test (ubuntu-22.04, clang)	5m 57s
test-no-crypto-build	1m 24s
build-test (alpine-3.15, gcc)	4m 21s
build-test (alpine-3.15, clang)	5m 18s
coverity-test	0s
	1h 37m 27s

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