FAPI: Fix session cleanup. #546

Job	Run time
test-coverage	5m 21s
scanbuild	6m 30s
coverity-test	0s
build-test (ubuntu-18.04, gcc)	4m 50s
build-test (ubuntu-18.04, clang)	5m 20s
test-fuzz	2m 38s
build-test (ubuntu-20.04, gcc)	4m 57s
test-no-crypto-build	1m 19s
test-mbedtls (ubuntu-20.04)	3m 1s
build-test (ubuntu-20.04, clang)	4m 40s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 40s
test-tcti-config	13m 55s
build-test (fedora-32, gcc)	5m 14s
build-test (fedora-32, clang)	5m 20s
build-test (opensuse-leap, gcc)	4m 54s
build-test (opensuse-leap, clang)	5m 1s
build-test (ubuntu-22.04, gcc)	5m 34s
build-test (ubuntu-22.04, clang)	5m 36s
build-test (alpine-3.15, gcc)	4m 12s
build-test (alpine-3.15, clang)	5m 7s
	1h 36m 9s

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