FAPI: Fix misleading error message. #2270

Job	Run time
test-coverage	5m 13s
coverity-test	0s
build-test (ubuntu-20.04, gcc)	4m 31s
scanbuild	6m 46s
build-test (ubuntu-20.04, clang)	4m 33s
build-test (fedora-32, gcc)	4m 57s
test-fuzz	2m 28s
test-mbedtls (ubuntu-20.04)	2m 55s
build-test (fedora-32, clang)	5m 3s
test-no-crypto-build	1m 19s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 42s
build-test (opensuse-leap, gcc)	4m 35s
test-tcti-config	14m 22s
build-test (opensuse-leap, clang)	4m 46s
build-test (ubuntu-22.04, gcc)	4m 26s
build-test (ubuntu-22.04, clang)	4m 40s
build-test (alpine-3.15, gcc)	4m 45s
build-test (alpine-3.15, clang)	4m 39s
	1h 22m 40s

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