esys: fix auth value handling in ChangeAuth programs. #459

Job	Run time
coverity-test	0s
test-coverage	7m 26s
build-test (ubuntu-18.04, gcc)	8m 24s
build-test (ubuntu-18.04, clang)	7m 24s
build-test (ubuntu-20.04, gcc)	8m 44s
build-test (ubuntu-20.04, clang)	6m 38s
build-test (fedora-32, gcc)	9m 57s
build-test (fedora-32, clang)	7m 55s
build-test (opensuse-leap, gcc)	7m 43s
build-test (opensuse-leap, clang)	7m 3s
build-test (ubuntu-22.04, gcc)	8m 20s
build-test (ubuntu-22.04, clang)	10m 3s
build-test (alpine-3.15, gcc)	6m 0s
build-test (alpine-3.15, clang)	9m 22s
scanbuild	12m 24s
test-fuzz	4m 27s
test-mbedtls (ubuntu-20.04)	4m 2s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	3m 44s
test-no-crypto-build	1m 34s
test-tcti-config	20m 26s
	2h 31m 36s

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