clang-tidy: fix bugprone-reserved-identifier (without API changes) #129

Job	Run time
test-coverage	5m 9s
coverity-test	0s
scanbuild	6m 35s
build-test (ubuntu-20.04, gcc)	4m 37s
test-fuzz	2m 36s
build-test (ubuntu-20.04, clang)	4m 26s
test-no-crypto-build	1m 25s
build-test (fedora-32, gcc)	4m 42s
test-mbedtls (ubuntu-20.04)	2m 52s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 55s
build-test (fedora-32, clang)	4m 55s
test-tcti-config	14m 23s
build-test (opensuse-leap, gcc)	4m 40s
build-test (opensuse-leap, clang)	4m 39s
build-test (ubuntu-22.04, gcc)	4m 26s
build-test (ubuntu-22.04, clang)	4m 30s
build-test (alpine-3.15, gcc)	3m 54s
build-test (alpine-3.15, clang)	4m 49s
	1h 21m 33s

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