FAPI: fix problems detected by scanner. #2222

Job	Run time
coverity-test	0s
build-test (ubuntu-20.04, gcc)	4m 23s
scanbuild	6m 30s
build-test (ubuntu-20.04, clang)	4m 12s
test-coverage	5m 9s
build-test (fedora-32, gcc)	4m 41s
test-fuzz	2m 32s
build-test (fedora-32, clang)	4m 57s
test-mbedtls (ubuntu-20.04)	2m 44s
build-test (opensuse-leap, gcc)	4m 29s
test-no-crypto-build	1m 17s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 40s
build-test (opensuse-leap, clang)	4m 39s
test-tcti-config	14m 6s
build-test (ubuntu-22.04, gcc)	4m 33s
build-test (ubuntu-22.04, clang)	4m 35s
build-test (alpine-3.15, gcc)	3m 52s
build-test (alpine-3.15, clang)	4m 37s
	1h 19m 56s

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