FAPI: Fix file io if d_type of dirent is not supported. #2272

Job	Run time
coverity-test	0s
build-test (ubuntu-20.04, gcc)	4m 20s
build-test (ubuntu-20.04, clang)	4m 15s
scanbuild	6m 45s
build-test (fedora-32, gcc)	4m 39s
test-coverage	5m 18s
test-fuzz	2m 32s
build-test (fedora-32, clang)	4m 54s
test-mbedtls (ubuntu-20.04)	2m 43s
build-test (opensuse-leap, gcc)	4m 24s
test-no-crypto-build	1m 15s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 38s
build-test (opensuse-leap, clang)	4m 36s
test-tcti-config	14m 26s
build-test (ubuntu-22.04, gcc)	4m 24s
build-test (ubuntu-22.04, clang)	4m 30s
build-test (alpine-3.15, gcc)	3m 44s
build-test (alpine-3.15, clang)	4m 40s
	1h 20m 3s

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