FAPI: Fix session cleanup. #1844

Job	Run time
scanbuild	6m 27s
build-test (ubuntu-18.04, gcc)	4m 17s
build-test (ubuntu-18.04, clang)	4m 50s
test-tcti-config	14m 17s
build-test (ubuntu-20.04, gcc)	4m 32s
coverity-test	0s
build-test (ubuntu-20.04, clang)	4m 19s
build-test (fedora-32, gcc)	4m 38s
test-coverage	5m 10s
build-test (fedora-32, clang)	4m 59s
test-fuzz	2m 33s
build-test (opensuse-leap, gcc)	4m 41s
build-test (opensuse-leap, clang)	4m 38s
test-mbedtls (ubuntu-20.04)	2m 53s
build-test (ubuntu-22.04, gcc)	4m 33s
test-no-crypto-build	1m 31s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 40s
build-test (ubuntu-22.04, clang)	4m 52s
build-test (alpine-3.15, gcc)	3m 56s
build-test (alpine-3.15, clang)	4m 52s
	1h 30m 38s

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